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Programming Car Keys at Home Car key reprogramming is a process that requires special equipment that only an auto locksmith has access to. Some manufacturers have technology that blocks anyone except the dealer from reprogramming your keys. Begin by inserting a blank key into ignition, without turning the engine on. The security light will turn on and remain on for three seconds. If you can hear the sound of the lock, then the process has been successful. Key fobs Key fobs have become more commonplace in both homes and bus