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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 technology that stops anyone other than the dealership from reprogramming keys. Start by inserting a blank key into the ignition, without turning the engine off. The security light will go on and remain lit for three seconds. If you hear a sound from the lock and the process is completed. Key fobs Key fobs are becoming more popular in