Replace BMW Key Battery It's probably time to change your battery if your BMW key won't open your car or turn on the engine. It's a simple fix. All you need to do is remove the cover of the key fob take it off, then replace the battery, and then https://thekeylab95140.kylieblog.com/30539538/why-is-there-all-this-fuss-about-bmw-key-fobs