Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it may be time to change your battery. Fortunately, it's a simple fix. You simply need to remove the key fob, then replace the battery and gently put it back. Follow https://carkeyrepairs69065.blogdeazar.com/30287848/three-reasons-why-the-reasons-for-your-bmw-3-series-key-fob-is-broken-and-how-to-repair-it