Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it may be time to change your battery. It's a simple fix. It's as easy as removing the key fob, replace the battery, and then gently put it back. Follow these https://car-key-programming43520.sharebyblog.com/30056066/the-ultimate-guide-to-bmw-3-series-key-fob