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What Are Key Programmers? Many modern cars have key / ignition systems that require reprogramming at some time. Key programmers can be useful in this case. Three situations may require a shop to be equipped with key-programming capabilities. The shop might need to program keys in three scenarios customers might need an additional key, or the keys are lost. OBD-II Key Programmer Units A car key programmer is a device that permits individuals to alter or add code of a transponder chip inside an automobile's key fob. This can