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How to Repair a Remote Key Although many remote key fobs have an impressive battery life, they will eventually wear out. Sometimes it's as simple as changing the batteries, but sometimes there are more serious issues. Remove the remote from the unit and clean the buttons. Then bend them out and in. These methods could be all that you need to get your key fob working properly. Battery If the fob continues to working you can replace the CR2025 or CR2032 battery. If it isn't then