WARNING: This page is about a different car, the 2018 Audi A6 Quattro, 2017 Audi A6 Quattro, and 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of AUDI OF AMERICA, LLC
-- Remove the left subframe bolt -2-.
NOTE:
The left bolts -1 and 3- and all of the right bolts for the subframe remain installed.