WARNING: This page is about a different car, the 2018 Audi S6, 2017 Audi S6, and 2016 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of AUDI OF AMERICA, LLC
NOTE:
Ignore item -2-.
-- Remove the right nut -1- and remove the bracket with the wiring harness from the subframe.