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Reprogramming Car Keys Transponder keys are said to be more secure for cars and harder to copy by thieves. The key could need to be programmed again in the event of damage or lost. You can change the key fobs you own but you must be aware of the proper procedure. It is essential to have these items to achieve the most effective results: Keys Almost all modern cars require some kind of transponder key or fob to operate, providing security and anti-theft protection. The keys are programmed by a locksmith or authorized deale