Replace BMW Key Battery If your BMW key isn't opening your vehicle or turning the engine, it may be time to replace your battery. It's simple to fix. All you have to do is take off the cover for the key fob take it off, then replace the battery, then https://car-key-repairs40304.blue-blogs.com/36784439/the-complete-list-of-bmw-key-fobs-dos-and-don-ts