WARNING: This page is about a different car, the 2015 Audi A7 Quattro and 2014 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Engine Cover
Courtesy of AUDI OF AMERICA, LLC
-- Carefully pull the engine cover off the bolts one after the other in direction of -arrows-. Do not pull sharply on the engine cover or pull it to one side.