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What Are Key Programmers? Modern automobiles have key/ignition systems that need to be reprogrammed at a certain time. Key programmers can be useful in this situation. There are three scenarios in which a shop might need to have key programming capabilities. There could be a no-start diagnostic or a customer is in need of an extra key or keys are missing. OBD-II Key Programmer Units A car key programmer allows one to modify or add a code on a transponder inside the keyfob of a car's. This can be done to permit an alternat