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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 prevents anyone except the dealer from reprogramming your keys. Start by inserting an empty key into the ignition, without turning the engine on. The security light will go on and remain lit for three seconds. If you hear a sound of a lock, then the process is done. Key fobs Key fobs are becoming more popular in both businesses