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Programming Car Keys at Home Reprogramming car keys is a difficult procedure that requires special tools that are available only to auto locksmiths. Some manufacturers have technology that prevents anyone except the dealership from reprogramming keys. Start by inserting one of your keys that are blank into the ignition but not activating the engine. The security light should come on and stay illuminated for three seconds. If you can hear the sound of the lock, then the procedure has been successful. Key fobs
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