Replace BMW Key Battery If your BMW key isn't opening the doors of your car or turning over the engine, it may 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 gently place it back. https://carkeyprogramming48690.bleepblogs.com/30554105/5-bmw-key-fobs-tips-you-must-know-about-for-2023