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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 a technology that prevents anyone but the dealership from changing keys. Begin by inserting an empty key into the ignition, without turning the engine off. The security light will turn on and remain on for three seconds. If you hear the sound of the lock, the process has been successful. Key fobs Key fobs have become more commonplace in both homes and bus