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How to Repair Car Key Fobs Even though we test them a lot, key fobs are not indestructible. In fact, they are able to break down in a variety of ways. Other issues can be more grave than a dead battery. Luckily, most of these issues can be solved with a quick DIY fix at home. Dead Battery A dead battery is the most common reason for a key fob that is not working. Fob batteries are prone to draining quickly, particularly if they're exposed to extreme temperatures, humidity, or water. It is a