How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't working properly, it probably just needs a new battery. Also known as coin batteries, they are easily obtainable and replaceable in just a few easy steps. Each fob is connected to a profile of the driver https://g28carkeys39791.isblog.net/how-bmw-battery-replacement-key-transformed-my-life-for-the-better-47944490