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How to Repair Car Key Fobs Key fobs can become damaged, even if we use them a lot. In fact, they are able to break down in a variety of ways. Other issues could be more important than an unresponsive battery. Many of these issues can be resolved with a quick fix at home. Dead Battery A dead battery is probably the most common reason why the car key fob stop working. Fob batteries are prone to draining quickly, especially if they're exposed to extreme temperatures, humidity, or water.