Replace BMW Key Battery If your BMW key isn't opening your vehicle or turning the engine, it could be the time to replace your battery. Fortunately, 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 steps https://thekeylab05326.bloggazzo.com/29560504/bmw-key-fobs-the-good-and-bad-about-bmw-key-fobs