How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't operating properly, it probably just needs an upgrade to the battery. They are also referred to as coin batteries that are easily replaced in a few easy steps. Each key is associated with a driver profile https://car-locksmith29116.prublogger.com/30123211/how-to-tell-if-you-re-prepared-to-bmw-battery-replacement-key