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How to Repair a Key Fob If you can't unlock your key fob to start your vehicle, it could be time to visit an automotive repair shop. But, before you do that, there are a few things you should be aware of. The most obvious reason why your key fob won't work is that it has a dead battery. The majority of key fobs are powered by traditional 3V button cells which are available in most stores. Dead Battery Your key fob's battery is responsible for providing the remote functions that allow you to unlock your vehicl