Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it might be time to change your battery. Fortunately, it's a simple fix. Simply remove the key fob, then replace the battery and gently place it back. Follow these steps to https://carkeyprogramming62812.dm-blog.com/30248266/7-tricks-to-help-make-the-most-of-your-bmw-key-fobs