How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't functioning properly, it probably just requires a new battery. Also known as coin batteries, they are readily available and replaceable in just a few easy steps. Each fob is associated with the profile of the driver https://g2847115.kylieblog.com/31216559/why-bmw-battery-replacement-key-is-more-risky-than-you-think