Replace BMW Key Battery It could be time to replace your battery If your BMW key isn't able to open your car or turn on the engine. Fortunately, it's a simple fix. You simply need to remove the key fob, then replace the battery, and then gently put it back. https://car-key-programming78076.ezblogz.com/61809296/9-signs-you-re-a-bmw-3-series-key-fob-expert