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How to Repair Key Fob Issues Despite their longevity, key fobs can get damaged or cease to function. This can be due to a variety of reasons. The most frequent reason is the battery is dead. Change the battery is an easy solution. Other problems might be more complicated. One possibility is interference with signals. It could also be a problem with the buttons. Battery Your key fob is a pretty small and fragile piece of plastic, so it can be easy to have things go wrong.