What Are Car Key Programmers? Car key programmers are devices that can clone a transponder in the memory of a vehicle. They can be used to replace keys that were lost or stolen. They can be used to reset oil service light, tire pressure warning lights and many other functions. https://carlocksmith37455.shotblogs.com/how-to-determine-if-you-re-set-to-go-after-car-key-reprogramming-43356524