Replace BMW Key Battery It could be time to replace your battery in the event that your BMW key isn't able to open your car or turn off the engine. It's a simple fix. It's as easy as removing the key fob, replace the battery and gently place it back. https://thekeylab71553.ambien-blog.com/36415982/why-bmw-key-fobs-is-more-dangerous-than-you-believed