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How to Repair a Remote Key Even though most remote key fobs come with impressive battery life, they will eventually degrade. Sometimes it's as simple as changing the batteries, but occasionally there are more serious problems. Take the remote apart 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 utilize CR2025 or CR2032 batteries, and they can often be swapped out when the fob is operat