64 12 681 Replacing temperature sensor for left or right electric auxiliary heating - rear passenger compartment
WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary work
NOTE:
Picture for example purposes.
Unlock temperature sensor (1) by turning and remove.