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. Fortunately, it's a simple fix. You simply need to remove the key fob, replace the battery, and then gently put it back. Follow these steps https://thekeylabcouk10953.bloggactivo.com/29720416/3-reasons-the-reasons-for-your-bmw-3-series-key-fob-is-broken-and-how-to-repair-it