63 12... Headlight fogging fault pattern

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Certain weather conditions can lead to fogging on the inside of the headlight lens.
This is not necessarily a fault that requires replacement of the headlight.

Permissible fogging. Headlight does not need to be replaced.
Impermissible fogging. Replace the headlight.

Fig 1: Identifying Permissible And Impermissible Fogging

Courtesy of BMW OF NORTH AMERICA, INC.