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How to Repair a Key Fob If you are unable to get your key fob to start the car, it may be time to take it to an automotive repair shop. But before you make that decision, there are some things to check first. The most obvious reason that your key fob isn't working is due to a dead battery. Most key fobs are powered by standard 3V button cells, that are sold in most stores. Dead Battery The battery on your key fob is responsible for providing the remote functions that allow you to unlock your vehicle, open th