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 also be used to reset oil service lights, tire pressure warning light and other functions. https://autolocksmiths74202.pointblog.net/what-is-car-key-reprogramming-and-how-to-use-it-70677644