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How to Repair Car Key Fobs Key fobs can become damaged, even if we use them a lot. They can break down in a variety of ways. Other issues can be more important than a dead battery. Fortunately, the majority of them can be resolved by a simple DIY fix at home. Dead Battery A dead battery is the most frequent cause of a key fob that is not working. Fob batteries drain quickly, especially if they're exposed to extreme temperatures, humidity or water. Keep an extra battery in your wallet in case you need it.