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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 go to an automotive repair shop. However before you go to that, there are some things to be aware of. The most obvious reason your key fob isn't functioning is due to a dead battery. Fortunately, most key fobs run on standard 3V button cell batteries that are readily found in most stores. Dead Battery The battery in your key fob powers remote functions that allow you to open or lock your car's tr