Replace BMW Key Battery If your BMW key isn't opening your car or turning on the engine, it may be time to replace your battery. It's a simple fix. It's as easy as removing the key fob, then replace the battery and gently put it back. Follow these steps and https://car-key-programming31388.myparisblog.com/30661648/15-of-the-best-documentaries-on-bmw-key-fobs