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. It's a simple fix. You simply need to remove the key fob, replace the battery and gently place it back. Follow these steps https://wwwthekeylabcouk59808.pages10.com/5-bmw-key-fobs-leÃÂ-ons-from-the-professionals-65785763