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How to Repair a Key Fob It may be time to take your car to an auto service if you cannot get the key fob to work. Before you visit an automotive repair shop you must first confirm the following things. The most obvious reason why your key fob isn't working is due to a dead battery. Luckily, most key fobs run on standard 3V button cell batteries which are readily available in most stores. Dead Battery The battery inside your key fob is responsible for the remote functions, which allow you to open or unlock your car's trunk,