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How to Replace a Dead Key Fob The majority of key fobs have batteries that look like watches, and are simple to replace at home. If your key fob isn't functioning properly, the first thing you need to do is replace the battery. If a new battery does not solve the problem it is necessary to find a professional who can re-program your key fob. Many shops provide this service at less than the dealership. Buttons Damaged When the buttons on a key fob begin to wear down and wear out, they can stop responding.