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How to Repair Car Key Fobs Even though we use them a lot keys are not indestructible. They are able to be destroyed in a variety of ways. Other issues could be more grave than a dead battery. The majority of problems can be fixed with a quick fix at home. Dead Battery A dead battery is probably the most common reason why a car key fob stops working. Fob batteries are known to drain quickly, especially if they are exposed to hot or cold temperatures, humidity or even water. Keep an extra battery in your wallet in case you require it. You will usually know