Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it could be the time to replace your battery. Fortunately, it's a simple fix. Simply remove the key fob, replace the battery, and then gently put it back. Follow these steps https://thekeylab-co-uk64427.bloguerosa.com/29414122/7-things-you-ve-never-knew-about-bmw-key-fobs