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Programming Car Keys at Home Reprogramming your car keys is a complex procedure that requires tools that are available only to auto locksmiths. Some manufacturers have technology that prevents anyone other than the dealer from reprogramming your keys. Start the process by inserting one of your keys that are blank into the ignition, without beginning the engine. The security light should turn on and remain illuminated for three seconds. If you hear a lock sound, then the process is done. Key fobs Key fobs are becoming inc