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How to Repair a Remote Key While the majority of remote key fobs come with excellent battery life, they'll eventually get worn out. Sometimes it's as simple as changing the batteries, however sometimes there are more serious problems. Take apart the remote and clean the buttons. Then, flex them in and out. could be all you need to get the key fob working. Battery If the fob is still functioning you can replace the CR2025 or CR2032 battery. If not accessible, you can take it off the fob and check the butt