Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it could be time to replace your battery. It's a simple fix. It's as easy as removing the key fob, then replace the battery and gently place it back. Follow these steps to https://car-key-replacement15087.like-blogs.com/30030845/a-step-by-step-guide-to-bmw-3-series-key-fob