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How to Replace a Dead Key Fob The majority of key fobs have flat watch-style batteries, which are easy to change at home. Replace if your fob ceases to function. A new battery may solve your issue however, if it doesn't you'll have to locate a service provider who can handle key fob reprogramming. Many shops offer this service at cheaper prices than the dealership. Damaged Buttons The buttons on a keyfob can become unresponsive when they start to wear out