In early model cars, there were 2 primary ways to tamper with an odometer; with an ice pick or a drill. After 1990, most cars had digital odometers, making them harder (not impossible) to change. As odometers got smarter, so did crooks.
Today, illegal devices to tamper with digital odometers are readily available. But you should also know that mileage on post 1990 cars is not only recorded by an odometer, but by other computer chips on your car.
Moreover, dealers frequently record the mileage on a car when it comes in for service to see if the work will be covered under factory warranty.
If your new/used car is running poorly, there is a good chance that the odometer was tampered with before you purchased it. There are several ways to verify the odometer accuracy besides the odometer itself. Lets find out together.