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How to Replace a Dead Key Fob The majority of key fobs are powered by flat watches which can be changed at home. If your fob isn't working correctly, the first thing you need to do is replace the battery. If a new battery does not solve the issue it is necessary to find someone who can re-program your key fob. There are a lot of shops that offer this service at a lower cost than the dealership. Damaged Buttons When the buttons on a key fob start to wear down, they can sometimes cease to