WARNING: This page is about a different car, the 2004 Audi S4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Bumper removed.
Remove bolt -2- on both sides.
Release locking tabs for the center piece of air inlet grid and remove it.
Release locking tabs -arrows- and remove lower part -1- of bumper cover.