Replace BMW Key Battery If your BMW key isn't opening the doors of your car or turning over the engine, it may be time to change 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. https://carkeyreplacement31461.win-blog.com/10329035/the-reason-bmw-key-fobs-is-fast-becoming-the-hottest-trend-of-2023