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How to Repair Car Key Fobs Although we test them many a times keys are not indestructible. They can actually be destroyed in a variety of ways. Other issues can be more grave than a dead battery. Most of problems can be fixed by a quick fix at home. Dead Battery A dead battery is the most frequent cause of the key fob not functioning. Fob batteries are prone to draining quickly, especially if they're exposed to extreme conditions like humidity, temperatures or even water. It's a good idea to keep an extra battery in your wallet in case. The LE