Replace BMW Key Battery If your BMW key isn't opening the doors of your vehicle or turning the engine, it may be time to replace your battery. It's a simple fix. Simply remove the key fob, then replace the battery, and then gently put it back. Follow these steps and https://carkeyreplacement39228.blogerus.com/52867344/what-is-bmw-key-fobs-and-why-is-everyone-talking-about-it