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How to Repair Car Key Fobs Key fobs are susceptible to damage even if we use them a lot. In fact, they are able to be destroyed in a variety of ways. Other issues can be more grave than a dead battery. Fortunately, the majority of these issues can be solved with a quick DIY fix at home. Dead Battery A dead battery is likely the most common reason why a car key fob stops functioning. Fob batteries can deplete quickly, especially if they are exposed or cold temperatures, humidity or water. Keep an extra batt