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Reprogramming Car Keys Car keys with transponders are believed to make vehicles more secure and harder for thieves to duplicate. However, a key may require reprogramming when it becomes damaged or lost. You can change the key fobs you own however, you must be aware of the proper procedure. For the best results you'll need the following items: Keys Most modern vehicles require a transponder key or fob to work, which provides security and anti-theft protection. These keys are programmed by a locksmith or an authorized deale