Replace BMW Key Battery If your BMW key isn't able to open your vehicle or turning the engine, it could be the time to replace your battery. Fortunately, it's a simple fix. It's as easy as removing the key fob, then replace the battery, and then gently put it back. https://the-key-lab79417.elbloglibre.com/30161524/it-s-time-to-expand-your-bmw-key-fobs-options