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How to Repair Car Key Fobs Even though we test them a lot keys aren't impervious to destruction. In fact, they could be destroyed in a variety of ways. Other issues can be more serious than an unresponsive battery. The majority of these issues can be resolved by a quick fix at home. Dead Battery A dead battery is probably the most common reason a car key fob stops functioning. Fob batteries drain quickly, particularly if they're exposed to extreme temperatures, humidity or water. Keep an extra battery in you