Replace BMW Key Battery If your BMW key isn't opening the doors of your vehicle or turning the engine, it may be the time to replace your battery. It's a simple fix. You simply need to remove the key fob, then replace the battery and gently place it back. Follow https://car-key-replacement02870.blogofchange.com/30637407/a-step-by-step-guide-for-choosing-the-right-bmw-key-fobs