Replace BMW Key Battery If your BMW key isn't opening your vehicle or turning the engine, it might be time to replace your battery. It's simple to fix. You simply need to remove the key fob, then replace the battery, and then gently put it back. Follow these steps and https://carkeyreplacement89308.bloggosite.com/36735047/bmw-key-fobs-s-history-of-bmw-key-fobs-in-10-milestones