Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it could be time to change your battery. Fortunately, it's a simple fix. It's as easy as removing the key fob, then replace the battery and gently put it back. Follow these steps https://carkeyprogramming62812.dm-blog.com/30248266/7-tricks-to-help-make-the-most-of-your-bmw-key-fobs