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What Are Key Programmers? Many modern cars have key / ignition systems which require a reprogramming at some point. This is the reason key programmers come in handy. There are three scenarios in which a shop might need to have key programming capabilities. They could run into an issue with no-starting diagnostics or the customer needs an additional key, or the keys have been lost. OBD-II Key Programmer Units A car key programmer is a device which allows one to modify or add a code on a transponder inside