Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it could be time to replace your battery. It's a simple fix. You simply need to remove the key fob, then replace the battery, and then gently put it back. Follow https://the-key-lab00949.smblogsites.com/30157362/7-tips-to-make-the-most-out-of-your-bmw-key-fobs