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How to Repair a Key Fob If you can't find your key fob and start the car, it might be time to visit an automotive repair shop. But before you go to that, there are some things to be aware of. The most obvious reason that your key fob isn't working is that it has a dead battery. The majority of key fobs are powered by standard 3V button cells, that are sold in most stores. Dead Battery The battery inside your key fob powers remote functions, which allow you to open or unlock the trunk, tailgate or trunk of your car, o