You can reset the mileage of a vehicle by using the diagnostic tool DiagProg4 by Dashboard Programming . It connects to the vehicle via the OBD II port and can alter or reset the odometer. You can connect DiagProg4 directly to a computer to update its software.
DiagProg4 is also capable of reading and erasing OBD system errors, resetting engine oil inspections, clearing accidents and making language selections. Dashboard Programming claims that it supports all possible communication protocols.
The U.S. Department of Justice considers resetting the mileage of a vehicle to be a felony. The act is punishable by fines up to $100,000. Moreover, if you sell a car after resetting its mileage, you have to either pay a fixed fee of $1,500 or cover the amount of damage caused to the buyer. The greater of the two applies.