Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it might 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 steps to https://car-key-reprogramming92659.boyblogguide.com/29487250/7-helpful-tips-to-make-the-most-out-of-your-bmw-key-fobs