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What Are Key Programmers? Many modern cars have ignition and key systems that require a reprogramming event at some time. This is the reason key programmers can be useful. There are three situations where shops may require key programming capabilities. There could be a no-start diagnostic, the customer wants an extra key or the keys have been lost. OBD-II Key Programmer Units A car key programmer is a device that allows a person to change or add the code on a transponder inside the keyfob of a car's. This is done