Replace BMW Key Battery If your BMW key isn't able to open your vehicle or turning the engine, it might be the time to replace your battery. It's an easy fix. It's as easy as removing the key fob, then replace the battery, and then gently put it back. Follow https://thekeylab54974.gynoblog.com/29682459/15-reasons-to-not-ignore-bmw-3-series-key-fob