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 change your battery. Fortunately, it's a simple fix. Simply remove the key fob, then replace the battery and gently put it back. Follow these steps to https://thekeylab35194.ourcodeblog.com/30301327/the-biggest-problem-with-bmw-3-series-key-fob-and-how-you-can-solve-it