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How to Repair a Remote Key Even though most remote key fobs come with impressive battery lifespan, they eventually degrade. 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, flex them in and out. These techniques might be all you need to get the key fob working. Battery Car key remotes are powered by CR2025 or CR2032 batteries, and they can often be swapped out if the fob i