Replace BMW Key Battery If your BMW key isn't opening the doors of your vehicle or turning the engine, it could be time to change your battery. Fortunately, it's an easy fix. Simply remove the key fob, then replace the battery, and then gently put it back. Follow these steps https://car-key-reprogramming09949.blogofoto.com/61314091/10-bmw-key-fobs-related-projects-that-stretch-your-creativity