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What Are Key Programmers? Modern cars come with ignition systems and keys that have to be reprogrammed at some time. This is where key programmers can be useful. There are three scenarios in which a shop might require key programming capabilities. There could be an issue with no-starting diagnostics or a customer is in need of an additional key or keys have been lost. OBD-II Key Programmer Units A car key programmer is a device that permits an individual to modify or add code of a transponder chip in a