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How to Repair a Key Fob If you are unable to unlock your key fob to start the car, it might be time to visit an automotive repair shop. Before you go to an automotive repair shop, you should first check the following things. The most obvious reason that your key fob won't work is due to a dead battery. Fortunately, the majority of key fobs are powered by normal 3V button cell batteries which are readily available in most stores. Dead Battery The battery inside your key fob powers rem