July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

27 10... Checking function of front differential and transfer case

WARNING: This page is about a different car, the 2012 BMW 328xi, 2011 BMW 328xi, 2010 BMW 328xi, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Fault diagnosis with DIS Tester.
Adhere to specified repair sequence in DIS.