Replace BMW Key Battery If your BMW key isn't opening the doors of your car or turning over the engine, it may be the time to replace your battery. It's a simple fix. Simply remove the key fob, replace the battery, and then gently put it back. Follow these steps https://thekeylab71553.ambien-blog.com/36470375/it-s-time-to-expand-your-bmw-key-fobs-options