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Programming Car Keys at Home Reprogramming keys for cars is a complex procedure that requires special tools that are only available to auto locksmiths. Some manufacturers have technology that prevents anyone except the dealership from reprogramming your keys. Begin by inserting one of your blank keys into the ignition but not activating the engine. The security light should come on and remain illuminated for three seconds. If you hear a sound from the lock and the process is completed. Key fobs Key fobs are becoming more