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What Are Key Programmers? Modern automobiles have key/ignition systems that need to be reprogrammed at a certain time. This is the reason key programmers can be useful. There are three scenarios where shops may need to have key programming capabilities. They might encounter an issue with no-starting diagnostics or the customer needs an extra key or the keys are missing. OBD-II Key Programmer Units A car key programmer allows one to modify or add a code on a transponder inside an automobile's keyfob.