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. It's a simple fix. It's as easy as removing the key fob, then replace the battery and gently put it back. Follow these steps and https://the-key-lab80178.p2blogs.com/29476393/this-is-the-advanced-guide-to-bmw-3-series-key-fob