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Programming Car Keys at Home Reprogramming your car keys is a process which requires specialized equipment only auto locksmiths have access to. Certain manufacturers have a technology that stops anyone other than the dealership from reprogramming your keys. Start by inserting an empty key into the ignition, without turning off the engine. The security light will come on and remain lit for three seconds. If you hear a sound of a lock it means the process is complete. Key fobs Key fobs are becoming increasingly popular in both businesses and homes. They are more ma