Replace BMW Key Battery It's probably time to change your battery in the event that your BMW key won't open your car or turn the engine. It's an easy fix. All you need to do is take off the cover for the key fob take it off, then replace the https://carkeyreprogramming21584.bloggerbags.com/35392509/a-handbook-for-bmw-key-fobs-from-beginning-to-end