What Are Car Key Programmers? The car key programmers can duplicate the transponder of the vehicle. They are useful for replacing stolen or lost keys. These can be used to reset oil service light, warning lights for tire pressure, and other lights. Most of these tools are bidirectional OBD II https://g28carkeys63579.nizarblog.com/29405954/what-is-car-key-reprogramming-and-why-is-everyone-talking-about-it