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How to Repair a Key Fob If you are unable to find your key fob and start the car, it may be time to visit an automotive service. However before you go to that there are some things to check first. The most obvious reason that your key fob won't work is that it has a dead battery. Fortunately, the majority of key fobs use standard 3V button cell batteries that are easily found in the majority of stores. Dead Battery The battery inside your key fob powers the remote functions, which enable you to open or l