Replace BMW Key Battery It could be the time to change your battery if your BMW key won't open your car or turn off the engine. It's a simple fix. Simply remove the key fob, replace the battery, and then gently put it back. Follow these steps and you'll be https://thekeylab-co-uk49920.mybjjblog.com/the-history-of-bmw-key-fobs-in-10-milestones-43420761