63 12... Headlight fogging fault pattern

WARNING: This page is about a different car, the 2010 BMW M5, 2009 BMW M5, 2008 BMW M5, 2007 BMW M5, and 2006 BMW M5. 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 Headlight Fogging Fault Pattern

Courtesy of BMW OF NORTH AMERICA, INC.