Replace BMW Key Battery If your BMW key isn't opening your car or turning on the engine, it may be time to replace your battery. It's simple to fix. All you need to do is remove the key fob cover, carefully remove and replace the battery, then insert it gently. https://the-key-lab08193.fireblogz.com/61465733/what-s-holding-back-the-bmw-3-series-key-fob-industry