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What Are Key Programmers? Most modern cars have key / ignition systems that require reprogramming at some time. This is the reason key programmers can be useful. There are three situations where shops might require key programming capabilities. They could run into an error message that says "no-start or a customer is in need of an additional key, or the keys have been lost. OBD-II Key Programmer Units A car key programmer is a device that lets you change or add the code on a transponder inside the keyfob of a car's. This is done to permit a different