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How to Repair a Key Fob If you're unable to find your key fob and start your car, it may be time to go to an automotive repair shop. But before you make that decision there are some things you need to examine first. Dead batteries are the main cause of your key fob not functioning. Fortunately, the majority of key fobs use regular 3V button cells which are readily found in the majority of stores. Dead Battery The battery in your key fob powers remote functions, which allow you to unlock or open your car's trunk, tailgate, or start the engine. The battery of your