Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it could be time to change your battery. It's simple to fix. It's as easy as removing the key fob, replace the battery and gently put it back. Follow these steps https://carkeyreplacements50126.therainblog.com/29318000/why-bmw-key-fobs-is-fast-becoming-the-hot-trend-of-2023