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How to Repair Car Key Fobs Key fobs can be damaged, even if we use them frequently. In fact, they could break down in a variety of ways. Other issues can be more serious than the battery being dead. Most of problems can be fixed with a simple fix at home. Dead Battery A dead battery is the most frequent cause of a key fob that is not working. Fob batteries are prone to draining quickly, especially if they're exposed to extreme conditions like humidity, temperatures or even water. Keep an extra battery