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How to Repair a Key Fob If you are unable to unlock your key fob to start your car, it may be time to visit an automotive repair shop. However, before you do that there are a few things you should check first. The most obvious reason that your key fob won't work is due to a dead battery. Most key fobs are powered by standard 3V button cells, that are sold in a majority of stores. Dead Battery Your key fob's battery is responsible for charging the remote functions tha