Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it might be time to change your battery. It's a simple fix. You simply need to remove the key fob, replace the battery, and then gently put it back. Follow these https://car-key-programming90152.blogunok.com/30353432/this-is-the-complete-listing-of-bmw-key-fobs-dos-and-don-ts