What to look for when buying a used car? Finding a trouble-free used car has nothing to do with luck. Everything you need when buying a used car is applying good research and investigative skills. Knowing what to check when buying a used car will avoid expensive automotive headaches down the road.

Shopping for and finding the right used car is more challenging than finding and buying a new car. When you find a new car that meets your needs and budget, you just have to buy it. When you look for a used vehicle, you have to find one that’s for sale, has low enough mileage to be attractive, is in good shape, hasn’t been crashed, and has been serviced properly. Then, you have to evaluate the seller, ensuring that it’s not someone who’s going to rip you off. 

Below, I’ll provide you with all the necessary advice and share with you a used car checklist.  Enjoy peace of mind and a great deal of your new pride and joy.

Buying a used car checklist  

When buying a used car, there are different hurdles to clear compared to when you’re buying new. however, it is just as crucial to get these right. Here are some general tips to consider when choosing and checking that second-hand vehicle.

First of all, you should figure out how much you can afford, as any car is a big investment. You will need to work out your budget and stick to it.

Once you’ve established how much you can spend on a used car, it’s time to find the right one for you. There are several online platforms, such as carfax car for sale, which is a useful source for used cars purchasers.

If after checking online sources you have one specific used car in mind that’s for sale from a dealership or private seller, it’s a good idea to check its history. A vehicle history report is derived from the car’s vehicle identification number (VIN) and will let you know if it has been involved in an accident, has a clean title, or has other issues. Vehicle history reports are available from Carfax and AutoCheck, and some listings will include it free. If you’re seriously considering a vehicle for sale from a private seller, getting a history report is an especially good idea to head off potential problems or sticking points.

Having gone through the history check it is time to go ahead with the test drive of the car- it’s vital to ensure that the car drives and handles correctly, and performs as you would expect.

You have got familiar with basic tips about what to look for when buying a used car, now let’s discuss the importance of mileage, which is on the top of a used car checklist.  

An ultimate checklist for buying a used car


One of the main details that every purchaser looks at is the mileage data. Since the data is considered to determine the lifetime of a car, it is preferable to know how many miles on a used car is too much. However, people can find devices on the market that are used for reducing the mileage data and artificially increasing the value of a car.

In general, a used car with low mileage is usually a good decision, even when the mileage seems unusually low. Some signs could indicate the car hasn’t been driven enough. However, you’ll first need to make sure that the odometer reading is accurate. 

By reviewing the vehicle history report, you typically get a good idea of whether it is correct. The appearance of the vehicle can also be a good indicator of whether the odometer is correct. A vehicle that hasn’t been driven a lot should have few dents and very little wear and tear.

If you believe the odometer reading is accurate, you should have the car inspected by a professional mechanic. While this is a good rule to follow when purchasing any new vehicle, it’s particularly important in situations where a car has very low mileage, because if the car has been sitting for a long time, certain parts could have dried out and may require immediate repair or replacement. 

Mileage and reliability of used cars

Mileage is one of the important details determining the price. However, in some cases, it can’t determine the reliability of a vehicle. A lot depends on how the vehicle is maintained. For instance, a newer vehicle can still be in a good condition despite the high mileage data. Even so, many individuals try to correct mileage data and lower it for earning more money. To avoid misleading, I’d suggest using the Mileage Blocker tool, which allows you to test vehicle maintenance without counting extra miles.

But if money isn’t your concern, then it won’t be a bad idea to splurge for a younger option. Just make sure that you’re paying attention to the overall condition of the vehicle. Always double-check mileage (don’t trust the odometer) and make sure you’re not dealing with tampering.

A used car technician or mechanic typically has a used car checklist. They need to evaluate on a second-hand vehicle. Most experienced technicians will be able to tell you immediately if something isn’t right with the vehicle, whether there are issues that need to be addressed right away and whether you should anticipate future problems.


Mileage and age have a different impact on the value of a vehicle, and they may not be closely related. Before you search for your ideal vehicle, it’s essential to know how mileage and age differ from one another. As we have already mentioned above, the number of miles on a vehicle’s odometer is one of the most important factors determining the price of a pre-owned car. It’s an indication of the amount of wear and tears the car has sustained over time. As such, a vehicle that has higher mileage will most likely be costlier than a similar vehicle with fewer miles. Generally, a car with lower mileage also offers better ride quality.

Additionally, you have to understand the different kinds of miles put on the car you intend to purchase. A car that’s mainly used in an urban area will show considerably more wear and tear than one that accumulates most of its miles on the highway. Also, a vehicle that has a dedicated owner tends to have a longer lifespan, especially if it has undergone regular servicing and prompt repairs whenever problems arise.

If everything in a vehicle is in good working condition, its age isn’t really important.

Most parts of a car wear down according to the number of miles traveled, but there are a few components that will be compromised as a result of aging. For example, rubber parts generally don’t age well, but they aren’t as expensive to replace. Minor problems like these shouldn’t discourage you from buying an older pre-owned car.

Mileage or age - what matters most

Is it possible to define the car value online?

Yes, it is possible to determine the car value with the help of several online sources, such as  Kelley Blue Book, which is a reliable company and one of the trusted resources helping many individuals to evaluate their cars accurately. The Kelly Book value is the result of massive amounts of data, including actual sales transactions and auction prices. It includes wholesale and retail transactions. The information is updated weekly to provide the most up-to-date information. With the help of the source, you can avoid overpricing the car and get true information about its current value. The Blue Book value by VIN and other details determines 4 condition levels: Fair, Good, Very Good, and Excellent. However, it’s quite hard to be unbiased. According to Kelley Blue Book website data, only 3% of used automobiles fit that description.

Other sources such as Edmunds and NADA also determine car value. Edmunds, similar to Blue Book, uses dealer transactions, consumer information, and car depreciation costs data. Upon indicating the vehicle’s model, manufacturer, year of the release, features, and mileage data, Edmunds determines its fair market value.

Used car buying pitfalls: things to watch out for 

Odometer fraud is quite widespread these days and it’s rather easy to deceive customers. People sell cars with mileage discrepancies quite frequently. They might utilize the best odometer correction tools out there, making it harder to detect fraud.

But there are ways to conduct a car mileage check to verify the mileage. Request reports, contact previous owners (if any), and evaluate the accuracy of mileage accordingly. Trust me, roll-backed odometers aren’t as easy to notice as they might seem.

The answer to the question “is mileage important when buying a used car” we have already answered above, that it is certainly a yes. Mileage can be the deciding factor when it comes to the condition of the vehicle. Though it might not always show the full picture, it will give us an idea about the true value of the car.

If you drive 10,000 – 12,000 miles a year, then we can easily say that you have average i.e. good annual mileage. Anything much higher than that number will be considered as high mileage. If you’re a car owner yourself, it will be a good idea to be proactive and pay attention to your driving habits.


If mileage is such a useless indicator how to check the performance of the car? The best way to check your car’s performance is to find an optimal testing environment and compare this data with the performance statistics provided by the manufacturer. However, you would like to avoid recording unnecessary mileage that will even worsen these stats. 

You can purchase a premium-quality Mileage Stopper, install it on your own in less than a half-hour and test the performance of your car. This module is useful for multiple purposes and you can always find a good use for it later. 


Thus, we have provided several tips on what to look for when buying a used car, that mileage is still on the top of a used car checklist and you should check the accuracy of the displayed numbers and make sure the odometer wasn’t rollbacked. If the odometer data looks perfect, check the condition of the overall vehicle. As a rule, you’ll find the best option if you look at the whole picture, not just parts of it. Good luck!

Knowing what is good mileage on a used car is a principal question that many people ask. Whether you are considering either to sell or to buy a used automobile, it is crucial to know what is good mileage on a car. Multiple factors influence the overall distance traveled by your automobile. However, it is not the sole factor that you can use to determine the condition of your car.

Is mileage so important?

Whether The mileage is an important factor for determining the condition of the vehicle will always be debatable. Car producers always provide data that states how many miles will your automobile last. Does this mean that it is truly the main determinant criterion to access the condition of an automobile? Not really, as some car makers exaggerate not only mileage but also all the other performance stats.

If you look at two different cases of vehicle owners, you will notice that despite the similar mileage their cars can be in thoroughly different conditions. For instance, if one person uses an automobile on a daily basis to get to work in the city and takes good care of it, it is highly likely that the car will have a long lifespan.

However, if another person recently bought the same automobile but uses it for racing and does not take good care of it, it might have half-life expectancy than the car from the previous example. The mileage is simply the indicator of the number of miles you have driven. However, it’s not only the number of miles that you have to take into consideration but also how you cover this distance.

Besides mileage, there are many crucial factors that affect the life expectancy of your car. For instance, driving habits, frequency of maintenance, weather conditions, road system, and many other factors will determine whether a car is in optimal condition or not.

What factors influence the mileage of the car?

What affects mileage on a vehicle?

As you have seen, many factors influence the condition of the car. However, the mileage is still a vital criterion as it is used to access the life expectancy of an automobile by the buyers. This is why so many people seek to find out what is good mileage on a car. Similarly, Insurance companies use this factor to determine the payments that you have to make annually. Hence, it is vital to know what affects this seemingly useless indicator and how to keep it at a reasonable level.

In order to know what is good mileage on a used car, it is essential to know the factors that will affect it. These factors are also essential to determine what good mileage on a car in general. The main factors that influence the mileage of the automobile are location, age, gender, income level, lifestyle, cultural traits, etc.


If you are one of those individuals who has to drive each day to work long distance you will know the importance of this factor. Such people tend to travel more than average (13,476 Miles / 21688 Km) and reach the expected life expectancy of their car sooner than average drivers.


As it appears the driving habits are noticeably different when we use age as a determinant factor. Based on Federal Highway Administration of the US, the drivers between 20-54 are more prone to long-distance traveling as they drive around 15,000 miles (24,000 Km) per year that is almost twice more than the drivers from other age groups (see table 1).


Gender also has a significant impact on driving habits. The male drivers seem to be more prone to driving long distances. According to the Federal Highway Administration of the US on average male drivers cover around 60% more distance than female drivers (see table 1).

Age Male Female Total (per year) 
16-19 8,206 6,873 7,624 Miles / 12,270 Km
20-34 17,976 12,004 15,098 Miles / 24,300 Km
35-54 18,858 11,464 15,291 Miles / 24608 Km
55-64 15,859 7,780 11,972 Miles / 19267 Km
65+ 10,304 4,785 7,646 Miles / 12305 Km
Average 16,550 10,142 13,476 Miles / 21688 Km

Income Level

Parkinson’s Law suggests that more we make more we spend. This rule applies to the mileage as well. Our income highly influences our behavior when we consider different methods of transportation. For instance, high-income makes us more willing to use our car for transportation on a daily basis even for significantly longer distances. On the other hand, if the income doesn’t allow us such luxury, we are more likely to use public transport.


Consider two different individuals. One person who admires traveling and covers long distances with an automobile each month and another person who lives close to work and uses car once in a while. You may have guessed that the mileage of these two cars will be significantly different. This example indicates the role of the lifestyle while determining the mileage of the automobile.

Cultural Traits

The culture that we are born in influences our character and lifestyle in general. For instance, in the Netherlands people use cars solely for certain situations and prefer bicycles for everyday life. On the other hand, In the US many towns are situated close to megalopolises and automobiles are the main method of transportation. Citizens of this towns will have to use an automobile on a daily basis if they work in the megalopolises.

The purpose of the car

Every automobile has its own purpose in the family especially when there are many families with more than one car. It is difficult to find an automobile that will offer all the advantages at once. Therefore, the purpose might vary from family transportation to speedy driving. Similarly, sometimes the car might even have several owners in the family that will significantly affect the mileage.

What is the average yearly mileage?

In order to determine what is good mileage on a used car, it is vital to know the average distance that we can use as a baseline. The average mileage around the world is 12,400 miles (20,000 Km) per year. However, these statistics differ depending on the country. For instance, as indicated in the table above, the average distance traveled in the US is 13,476 miles (21,688 Km).

Usually the appropriate department of each country states these statistics specifically for their country. Therefore, you can always check the relevant website that will provide the most up-to-date data for your country.

The carmakers with the highest reported life spans

Which cars have higher lifespan?

To understand what is good mileage on a used car it is vital to know the differences among the carmakers. The mileage is an important differentiating factor that automobile producers state when they introduce a new model. Despite the complex nature of a car’s life expectancy, the mileage still represents the decisive factor for car buyers.

To determine the life span of different automobile makers we cannot simply rely on the statistics that they provide. Most of the time they tend to overstate such characteristics to boost the sales in the short-term, hoping that after 10 years of car exploitation the owners will not be able to recall the misleading characteristics. Here are automobile manufacturers that truly meet or exceed the expectations and have proven to have superior life expectancy:

  • Toyota: Automobiles of this amazing car maker can sometimes exceed 250,000 miles (400,000 Km);
  • Mazda: Can go up to 200,000 miles (320,000 Km);
  • Honda;
  • Ford: Even though Ford has a noticeable place in this list, it only applies to trucks and SUVs models;
  • Chevrolet: Similarly to Ford, long-lasting nature applies to trucks and SUVs only;

How many miles is too many?

Let’s look at the limit that you have to keep in mind when buying a used car. Imagine buying a used automobile that you have to keep under maintenance each month. This is quite common when a car has already reached its limits. Therefore, it is crucial to know the margin of the automobile’s life span that you have to observe.

150,000 miles (241,000 Km) is a limit that applies to most of the carmakers. The most vital takeaway is to keep the expected life expectancy of your car model in mind. Let’s look at the example that will show the importance of this criterion when you make a buying decision. However, as we have seen in most cases it can be irrelevant figure.

Let’s take the example of the US. if you buy 10 years old average Toyota car in the US, it will have mileage around 130,000 miles (217,000 Km). As we have mentioned Toyota Automobiles can go up to and even exceed 250,000 miles (402,000 Km). Hence, you will be left with 120,000 miles (185,000 Km) driving that also means almost 9 years of life span.

On the other hand, there are a plethora of cars that cannot go up to 100,000 miles. Therefore, buying such automobiles with the mileage as low as 70,000 miles will mean around 2 years of life span left.

What is good mileage on a used car?

Any mileage below 110,000 miles is a reasonable mileage that you would not like to exceed when purchasing a used automobile. As you have seen there are many factors that you have to consider while determining the lifespan of your car or a car that you intend to buy. However, as we have discussed in the previous paragraph, some automobiles cannot even last more than 100,000 miles. It is essential to make in-depth research before you decide to consider any offers.

If you intend to buy second-hand automobile firstly use the optimal mileage suggestions that we provided to find the most reasonable options. Secondly, look for reviews online related to the longevity of those cars. I would not suggest relying solely on the statistics that manufacturers state on the official websites.

This information will be enough to estimate the remaining life expectancy of the automobile in terms of mileage. Simply devide this number by the average yearly mileage (12,400 Miles worldwide, 13,476 Miles in the US) and you will get the approximate number of years that the car will serve you. For more precise results you can take into account your driving habits or usage data from experience and determine your average early mileage.

Don’t expect to get the precise assumptions. Whether the previous owner took good care of the car or not will highly impact these presumptions. There is always a risk when you buy a second-hand automobile.

Keep your car’s mileage reasonable

If you would like to sell your second-hand car or just keep your car mileage reasonable you have to make sure that the health of your automobile is in optimal condition. Even though it might even be a useless indicator in certain cases, you may find it problematic to sell an automobile with high mileage. Therefore, it is essential to keep it at a reasonable level.

If you find this step unnecessary you may have to think again. It will also help your automobile last longer as wear and tear significantly affects the condition of the car. Even if you don’t consider selling your automobile in the near future, avoiding unnecessary journeys with your car will save you time and money required for its annual maintenance.

How to avoid misleading mileage data?

As you have already seen the mileage of your car is an important characteristic that you have to be cautious about. However, sometimes this data might be misleading if your automobile is not functioning as it has to. For instance, even the slightest changes in the tire size can significantly affect the mileage in the long run.

The mileage is calculated by multiplying the number of wheel rotations on the circumference of the wheel that came with an original automobile. Any changes to the size of the tire to enhance the appearance of your car or even wear and tear will affect the mileage that will be recorded in the memory of your automobile.

To solve this issue, you can always be proactive and make sure your tires are of optimal size. It would be almost impossible to prove buyers of your second-hand car that the mileage is significantly exaggerated.

How to test the performance of your car?

How to check the performance of the car if mileage is so useless indicator? The best way to check your automobile’s performance is to find an optimal testing environment and compare this data with the performance statistics provided by the manufacturer. However, you would like to avoid recording unnecessary mileage that will even worsen these stats.

You can purchase a premium-quality Mileage Stopper, install it on your own in less than half-hour, and test the performance of your car. This module is useful for multiple purposes and you can always find good use for it later.


Now you have all the information that you might need to determine what is good mileage on a used car. Multiple factors affect the performance of the automobile. However, the mileage is used to portray the whole picture of your automobile’s condition. Calculating the optimal amount of distance traveled by the used automobile is not as easy as it might seem. Many underlying factors influence the overall life expectancy and you have to make required assumptions.

Why is mileage important? It’s quite a complicated question, as it’s impossible to state one single reason. It can be overrated in certain cases, and it can also be neglected. Either way, it is undeniable that it’s an important factor when we’re dealing with used cars. If you have all the necessary information as a buyer, sellers will have a hard time ripping you off. And as a seller yourself, you’ll know how to price your car in terms of mileage.

Let’s continue our discussion and figure out what’s the meaning and importance of mileage in the auto industry. It’s time to dig deeper, isn’t it?

What is the mileage and how is it measured?

Mileage is the number of miles your car has traveled during a certain amount of time. The numbers we see on the odometer usually depict the distance your vehicle has covered throughout its lifespan. In certain cases, it could even indicate the fuel efficiency of your car.

Regardless of the definition, mileage is something everybody is interested in. Luckily, we don’t need to have a pad and a pen to track those miles on our own. Be it an old car or a new model, mileage is measured for us.

The odometer is the genius mind here. You’ll find this fella on the instrument cluster. It measures miles by counting the rotations of the wheels and multiplying it by the circumference of the tire. To make sure you always have the correct numbers on display, you need to get standard tires. That way, you’ll avoid any discrepancies that might occur if you have smaller/bigger tires.

How important is mileage on a used car anyway? – we’ll answer that question in a sec. For now, let’s see why odometer data matters when buying a used car.

Is mileage important when buying a used car and why?

The importance of mileage when buying a second-hand car

The answer to the question “is mileage important when buying a used car” is certainly a yes. Mileage can be the deciding factor when it comes to the condition of the vehicle. Though it might not always show the full picture, it will give us an idea about the true value of the car.
If you drive 10,000 – 12,000 miles a year, then we can easily say that you have average i.e. good annual mileage. Anything much higher than that number will be considered as high mileage. If you’re a car owner yourself, it will be a good idea to be proactive and pay attention to your driving habits.

Now, a higher number of traveled distance usually indicates the wear and tear of the car. The parts of your vehicle have their lifespan. For instance, you might have to change the brake pads after you drive 20,000 miles, etc. When we see a car with a mileage of 100,000, we can assume that it has been through a lot.

If you’re wondering “how important is mileage on a used car”, you should remember that people consider more than 200,000 miles as too many i.e. bad. As a result, the price of the pre-owned car drops significantly.

Low mileage isn’t the best alternative either. If numbers on the odometer are suspiciously low, you might be looking at a car that has been sitting in storage for ages. Environmental factors, such as heat (during summer months) and humidity, can affect the internal system of the vehicle. Therefore, it’s always important to be suspicious about the mileage and double-check the condition of the car if the mileage is too low.

Moreover, low mileage should be a red flag as it might indicate possible fraud. If you see the mileage that’s way below the average, then you should check whether the odometer has been clocked or not. By being curious about the history of the car, you’ll be able to protect yourself from deception.

How important is mileage on a used car?

It depends on the scenario. In the majority of cases, you can follow the following rule of thumb: higher mileage = poor condition. However, this rule isn’t set in stone.

Why is mileage important? – because it determines if a car in question is worth your money or not. It can seriously affect the value of the vehicle and shift your opinion about the condition of a used car. Nevertheless, there are other questions that we should also be asking before buying a used car.

Sometimes it can be crucial to know to what extent it matters how many miles are too much for a used carIf the owner was meticulous and paid attention to car care, then high mileage might not make that big of a difference. You can check the treadwear numbers, check the interior, examine the parts of the vehicle. If everything is in perfect condition, then you don’t have anything to worry about.

Similarly, if the car had a crappy owner who could not care less about the condition of their vehicle, then low mileage isn’t something you should consider.

Why does low mileage matter to car owners? – we can think of different reasons, but the most important one is insurance. The majority of insurance companies check your annual mileage and calculate the premium accordingly. They will ask you for the estimated annual mileage when you fill out the application. It’s crucially important to know approximate numbers to avoid any trouble.

Keeping track of your driving habits will essentially save you a lot of money. Your insurance rates will remain the same if your actual covered distance is similar to the estimated one. Unless you’re driving a supercar, you’ll probably be driving around 10,000 miles per year.

Insurance rates and the importance of mileage will vary from one country to another. It’s always better to be in the know beforehand. Once you cross the line of average mileage, it will be hard to go back.

Is mileage important when buying a used car anyway?

The role of mileage when buying a used automobile

If getting deceived isn’t one of the things on your bucket list, then you should care about the covered distance. Though it isn’t always the determining factor, it’s definitely something we should keep in mind if we want to buy a used car.

If you’re unsure whether the displayed numbers are accurate or not, you can always ask the car owner to transfer all the necessary documents. It could be the car title or the history reports that will give you information about the previous mileage. That way, you’ll also make sure that you’re buying from a trustworthy seller.

Is mileage important when buying a used car? – It certainly is. Not only does it give us information about the condition of various vehicles, but it also displays warning signs. Displayed numbers on the odometer show you whether the car is up and running or not. Many of you might argue with this statement, but trust me, the data depicts true information more often than not.

You won’t understand the importance of miles data unless you know what to look for. If you’re willing to buy a decent car that will last you through a lifetime, then the covered distance isn’t the only thing you should consider. But if you want the used car to be relatively new, then mileage can be the determining factor.

Which tools do people use to reduce mileage?

People mainly use the mileage correction and blocker tools to alter existing data and sell a vehicle for a better price. These two operate differently, however, they both deal with odometer-related issues.
You already know how important is mileage when buying a used car. Therefore, it shouldn’t be surprising to hear that people solve high-mileage problems with specific devices. Even though such actions aren’t ethical, I personally understand the intentions behind mileage correction.

Mileage correction tools

Mileage correction tools are devices that can reverse the odometer and remove unwanted miles. You can usually connect them to the vehicle directly and use them right away. However, the majority of such units are traceable. They can’t access the information that your vehicle stores on internal computers. As a result, diagnostic testers easily discover the correction.

Mileage blocker

A mileage blocker is a more ethical alternative. Instead of removing driven miles, it simply stops recording additional distance. Manufacturers created it for testing purposes to help customers check the functionalities of their cars effortlessly. This module offers untraceable performance – it doesn’t matter if your odometer records the data in km or miles.

Since the miles blocker stops recording mileage in control units, some people activate it on the highway. Some of them want to make up for existing discrepancies, while others want to earn more profit from selling their vehicles. Either way, it’s better to use this tool in a controlled environment.

If you simply want to check the performance of your car, buying a high-quality blocker tool is a great idea. In case of any further questions, you can always contact the support team of the company.


Why is mileage important when buying a used car? – well, it’s a debatable question. Yet, it’s undeniable that the data is something that deserves our attention. You should always take covered distance (be it high or low) with a grain of salt.

Check the accuracy of the displayed numbers and make sure the odometer wasn’t clocked. If the odometer data looks perfect, check the condition of the overall vehicle. As a rule, you’ll find the best option if you look at the whole picture, not just parts of it. Good luck!

Mileage is an important problem for most people. Though it’s not a determinant factor, it’s still something we take into account while purchasing a used car. That’s why a lot of attention is directed towards the numbers on the odometer. If it’s too high, the vehicle costs way less. This has forced the sellers to find a way around it. Consequently, they have turned to mileage-related tools. It’s important to know whether it’s possible to remove mileage from all control units or not. Let’s dig deeper, figure out what these tools are capable of and how they are connected to control units.

What are the control units?

Control units have turned into vital components of any vehicle. They are central systems that control and manage the operation of the processor or other parts of the car. Think of them as tiny brains that receive and transmit information to make sure everything works properly. To speak more generally, a control unit is an integral part of the central processing unit (CPU). Therefore, the CPU control unit is in charge of any operation that takes place in the computer.

Other than transferring information from one device to the other, the control unit is also capable of interpreting and decoding the data it receives. If any component of the processor fails, the control unit will be the part that will have the information about its crash. It also stores the information and could be the biggest “memory bank” for the processor data.

The majority of modern cars consist of such computers. If older vehicles used only a couple of control units, nowadays the automotive industry is heavily relying on these devices. With their help, it’s possible to create a system that easily transfers information from one part to the other. This ensures the clockwork operation that we expect from any car. Every electronic component of your beloved vehicle is operated through control units. You should thank these fellas if you like closing the doors and opening windows with a press of a button.

The types of control units

Be it the mileage, fuel control, engine control, or any other function of the vehicle – they all operate with the help of Electronic Control Units (ECUs). Therefore, there are many types of these computers. They have smaller tasks to perform, but they have to communicate with one another.

Engine control, transmission control, suspension control, body control module, and telematics control – are the modules that are commonly used in the modern automobile industry. There are other control units such as electronic control of braking systems, roof and cruise control, electronic door control, and so on. However, the most important one for this discussion is the Engine Control Unit.

The engine control unit is in charge of (you guessed it) the engine. It’s a computerized system that manages the fuel injection and oversees the overall functionality of the engine. However, that’s not the only thing it does. Once it collects the data, it then transmits it to the processor. The latter is capable of reading the information, but it can also record it. The same thing happens with the mileage. The engine control unit reads the information about the mileage and records it in its system. In a world where odometer fraud is so widespread, it’s crucial to know where and how the mileage is stored.

ALU (Arithmetic Logic Unit) VS CU (Control Unit)

Arithmetic Logic Unit VS Control Unit

Arithmetic Logic Unit (ALU) is one of the main components of modern computing. It’s the circuit that is in charge of interpreting and processing the data it receives. It deals with mathematical calculations that are needed to perform various actions. This unit must have interminable access to random access memory (RAM). Its input and output are designed in a way that guarantees the continual flow of information.

ALU receives the data i.e. operation code, which tells it what to do and how. After that, this unit can start performing its main functions: arithmetic, logical, or bit-shifting operations. In brief, ALU is one of the passages that are in charge of interpreting the data and drawing logical conclusions.

The control unit, on the contrary, is the vital component of the computer processor. It’s the brain behind various operations as it gives instructions to other parts of the system. It guarantees communication between software and hardware. It communicates with memory, as well as input and output devices to make sure they know how to perform various operations.

ALU control unit is an integral part of the CU. It gets directions from the control unit and performs accordingly. To put it simply, you should think of them as the “part” (ALU) and “whole” (CU). ALU depends on the instructions from CU. It can’t operate without them.

What is the connection between control units and mileage?

As I have already mentioned, ECU i.e. engine control unit is directly connected to the mileage. It stores the data about the miles your car travels. This is possible with the help of the CAN (controller-area networking), which is one of the standards manufacturers use in modern vehicles. It transmits data rather quickly, which means it’s an efficient approach to communications.

The information flows interminably between the dashboard and the CAN bus system. Therefore, the CPU control unit can store important data about the car. This means that the odometer isn’t the only part of the car which has information about the mileage. If you were to use the mileage rollback tool, you’d be able to change data on the odometer, yet you wouldn’t be able to correct it in the CPU unit. It would create discrepancies, which are easy to check with diagnostic testers.

We might think that mileage is simply a number on the odometer, but it’s not. We should never forget that modern technology relies on various computers, be it control units or various tools. Back when cars used analog systems, rolling back the mileage was a piece of cake.

However, modern developments have turned that business into a complicated task. Some people even thought that such developments would put an end to the odometer fraud. Even though it wasn’t capable of eliminating it, it still managed to make it easily detectable. Nevertheless, people still use mileage-related tools.

Which tools do people use to deal with mileage-related issues?

The most common tools people use to solve mileage-related issues are odometer correction tools and mileage blockers. These devices are quite different from one another. It’s important to know all the differences, otherwise, you might get confused and become a victim of fraud.

People pay a lot of attention to the mileage. Even though it doesn’t reflect the condition of the vehicle fully, it’s still one of the most important factors. Therefore, the sellers do everything they can to prevent the mileage from increasing. After all, large numbers on the odometers are usually deal-breakers for the customers.

Odometer Correction Tools

As mentioned, one of the tools that people use to deal with mileage-related issues is the odometer rollback device. It’s equipment that can reverse or reset the miles on the odometer. It’s a powerful unit that can change the mileage in a couple of minutes.

People use it for many different reasons, yet it’s still quite controversial. When dealers rewind the miles on the trip meter, they are lying about the condition of the vehicle. This tool leads to deception and fraud, which means you should always take it with a grain of salt. Plus, selling cars with odometer discrepancy is not only unethical, but it could also be illegal in certain countries or states.

Mileage blockers

The other tool people turn to is a mileage blocker (a.k.a. kilometer stopper). Unlike the odometer changer, it doesn’t roll back the mileage – it just stops recording it. The manufacturers essentially designed it for testing the performance of the vehicle. The device has simple installation instruction and anyone can easily install it. Compared to the odometer correction tools, a kilometer stopper is way more ethical as it’s meant for testing purposes. However, people use this tool on the open road. It’s unethical to employ a mileage blocker in such a way, as it doesn’t have fraudulent purposes. One way to avoid deception is to purchase the mileage blocker from a trustworthy manufacturer. You can always find additional information on support page or contact the customer center in case of any further questions.

Do they affect mileage in all control units?

Is mileage changed in control units?

To answer this question, we have to examine the functionalities of the odometer correction tool and a mileage blocker. As we have mentioned, the former is capable of reprogramming the odometer, while the latter stops recording the mileage. This also means that they target different control units in your car.

An odometer adjustment tool can change the data on the odometer only. Even though it’s a computer that connects to the system of your vehicle, it’s not almighty. It’s not powerful enough to change the mileage in the CU control unit, ALU control unit, or the ECU. This means that the performance of this tool is quite easy to detect with diagnostic testers. You could even request the history reports of the vehicle and check all the information about the mileage. That way, you’ll be able to find out if there’s any discrepancy.

Things are quite different when it comes to a mileage blocker. It stops recording the mileage in all the systems of your vehicle. Be it the car, truck, or SUV, it’s capable of delivering similar results. Even though it affects the whole CU system (i.e. the control process unit, ECU, and its CAN bus), it’s not advisable to use it that way. You should not use the mileage blocker for deception and fraud. Once again, its sole purpose is to test the overall performance of your vehicle. The fact that it affects the mileage in all control units is the main advantage of the mileage blocker, yet it doesn’t mean that you should use it against it. After all, you can avoid a lot of trouble if you purchase and use this tool for its intended purpose.


Mileage can be quite a headache for many. Whether you want to sell your vehicle or not, I’m sure you’re still bothered with the increasing numbers on the trip meter. Trust me, you’re not alone. We’ve all experienced a similar feeling in one way or another. However, our frustration can’t justify committing fraud and deceiving buyers.

It’s always important to give customers full information about the condition of the car. Plus, it’s impossible to remove the mileage from all control units using an odometer rollback tool. Even though the mileage stopper affects all control units, it’s not meant to be utilized on the public roads. Therefore, we should face the reality and admit that increased mileage is a natural process. Everything has its due date, right?