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What Are Key Programmers? Modern vehicles have key/ignition systems that need to be programmed at some point. Key programmers are useful in this case. Three scenarios could require a shop to have key-programming capabilities. The shop might need to program keys in three scenarios the customer may need an extra key or the keys are lost. OBD-II Key Programmer Units A car key programmer is a device that permits the user to alter or add code contained in the transponder chip inside an automobile's key fob. Th