How to Upgrade Your BMW Key 1 Series If your BMW keyfob isn't functioning correctly, you might require a new battery. Also referred to a coin battery, these can be easily replaced with just a few steps. Each fob is associated with the profile of the driver, and each key https://carlocksmith37455.shotblogs.com/a-step-by-step-guide-to-bmw-battery-replacement-key-from-start-to-finish-44722123