Replace BMW Key Battery If your BMW key isn't opening your car or turning on the engine, it could be time to replace your battery. Fortunately, it's an easy fix. It's as easy as removing the key fob, replace the battery and gently put it back. Follow these steps and https://carkeyreprogramming77025.blogkoo.com/9-signs-that-you-re-a-bmw-3-series-key-fob-expert-49835536