Replace BMW Key Battery It's probably time to replace your battery if your BMW key isn't able to open your car or turn the engine. It's simple to fix. You simply need to remove the key fob, then replace the battery, and then gently put it back. Follow these steps https://thekeylabcouk97411.blognody.com/30248291/10-real-reasons-people-hate-bmw-3-series-key-fob