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How to Repair a Key Fob If you are unable to unlock your key fob to start the car, it may be time to take it to an automotive repair shop. Before you visit an automotive service you must first confirm the following things. The most obvious reason why your key fob isn't functioning is a dead battery. Luckily, most key fobs use standard 3V button cell batteries that are readily available at most stores. Dead Battery The battery inside your key fob is responsible for the remote functions, wh