What Are Car Key Programmers? Car key programmers are devices that replicate a transponder into the memory of a car. They are useful for replacing keys that have been stolen or lost. They can also be used to reset oil service lights and tire pressure warning lights and other functions. https://g28carkeys97431.gynoblog.com/28820447/this-is-a-guide-to-car-key-reprogramming-in-2023