How to Upgrade Your BMW Key 1 Series If your BMW keyfob isn't functioning properly, you may just require a new battery. These are also known as coin batteries and can be replaced with just a few steps. Each fob is associated with a driver profile, and each key can https://carlocksmith37455.shotblogs.com/a-step-by-step-guide-to-bmw-battery-replacement-key-from-start-to-finish-44722123