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Programming Car Keys at Home Reprogramming keys for cars is a complicated procedure that requires tools that are only available to auto locksmiths. Certain manufacturers have technology that blocks anyone except the dealership from reprogramming keys. Start the process by inserting one of your blank keys into the ignition without starting the engine. The security light will turn on and remain illuminated for three seconds. If you hear a sound of a lock and the process is done. Key fobs Key fobs are becoming more popular in