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How to Repair a Remote Key Although most remote key fobs are equipped with impressive battery lives they will eventually wear out. Sometimes it's simple to replace the batteries in the device, however sometimes the issue can be more serious. Take the remote apart and clean the buttons. Then bend them in and out. These methods could be all you need to get your key fob working. Battery If the fob is still functioning you can replace the CR2025 or CR2032 battery. If it isn't, you can open the fob