What Are Car Key Programmers? Car key programmers are devices that can replicate a transponder into the memory of a car. They can be used to replace keys that have been lost or stolen. They can be used to reset oil service light, tire pressure warning lights and other lights. https://autolocksmiths59211.ampedpages.com/5-reasons-car-keys-programmed-can-be-a-beneficial-thing-56687737