Replace BMW Key Battery It's probably time to change your battery if your BMW key won't allow you to open your car or turn off the engine. It's a simple fix. You simply need to remove the key fob, replace the battery and gently place it back. Follow these steps https://thekeylab67496.blog2learn.com/78176737/a-step-by-step-guide-to-choosing-the-right-bmw-key-fobs