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How to Repair a Key Fob It could be time to take your vehicle to an automotive service if you're unable to get the key fob to function. Before you visit an automotive service it is important to first verify a few things. The most obvious reason your key fob won't work is a dead battery. The majority of key fobs are powered by conventional 3V button cells which can be found in most stores. Dead Battery The battery in your key fob powers the remote functions, which enable you to unlock