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How to Repair a Key Fob If you can't get your key fob to start your car, it may be time to take it to an automotive repair shop. However, before you do that, there are some things you need to check first. Dead batteries are the most obvious reason for your key fob's inability to function. The majority of key fobs are powered by traditional 3V button cells that are sold in a majority of stores. Dead Battery The battery in your key fob powers the remote functions, which allow you to open o