Replace BMW Key Battery It might be time to change your battery if your BMW key won't allow you to open your car or turn off the engine. It's a simple fix. Simply remove the key fob, replace the battery, and then gently put it back. Follow these steps and https://car-key-replacement36614.blogchaat.com/30150663/why-bmw-key-fobs-is-your-next-big-obsession