Replace BMW Key Battery It's probably the time to change your battery in the event that your BMW key won't open your car or turn on the engine. It's a simple fix. You simply need to remove the key fob, then replace the battery and gently place it back. Follow https://car-key-repairs40304.blue-blogs.com/36858931/how-to-find-the-perfect-bmw-key-fobs-on-the-internet