Replace BMW Key Battery It could be time to replace your battery if your BMW key won't open your car or turn on the engine. It's simple to fix. It's as easy as removing the key fob, then replace the battery, and then gently put it back. Follow these steps https://thekeylab71553.ambien-blog.com/36415982/why-bmw-key-fobs-is-more-dangerous-than-you-believed