Replace BMW Key Battery It might be time to change your battery if your BMW key won't open your car or turn the engine. It's a simple fix. All you have to do is take off the key fob cover, carefully remove and replace the battery, and put it back https://thekeylab-co-uk42025.humor-blog.com/29416833/what-bmw-key-fobs-experts-want-you-to-know