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What Are Key Programmers? The majority of modern vehicles have key / ignition systems which require a reprogramming at some point. This is the reason key programmers can be useful. Three situations may require a store to have key-programming capabilities. The shop might need to program keys in three scenarios the customer may need an extra key or keys are lost. OBD-II Key Programmer Units A car key programmer allows a person to change or add the code of a transponder within an automobile's keyfob