Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it might be the time to replace your battery. It's a simple fix. You simply need to remove the key fob, replace the battery, and then gently put it back. Follow these steps https://car-key-repairs43103.blogpayz.com/30223160/say-yes-to-these-5-bmw-key-fobs-tips