Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it could be time to change your battery. It's a simple fix. You simply need to remove the key fob, then replace the battery and gently place it back. Follow these https://thekeylab95140.kylieblog.com/30703261/so-you-ve-bought-bmw-3-series-key-fob-now-what