Replace BMW Key Battery It could be the time to change your battery If your BMW key isn't able to open your car or turn on the engine. Fortunately, it's a simple fix. You simply need to remove the key fob, replace the battery, and then gently put it back. https://carkeyreprogramming54655.qodsblog.com/30141334/7-helpful-tips-to-make-the-most-of-your-bmw-key-fobs