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Programming Car Keys at Home Reprogramming your car keys is a procedure which requires specialized equipment only auto locksmiths have access to. Certain manufacturers have technology that blocks anyone other than the dealership from reprogramming your keys. Start the process by inserting one of your blank keys into the ignition without starting the engine. The security light will go on and remain lit for three seconds. If you hear a sound from the lock it means the process is complete. Key fobs