Section 428 (Exhaust System, Emission Controls [DKNA,DLHA,DLHB,DKWB])

WARNING: This page is about a different car, the 2021 Audi A6 Quattro, 2020 Audi A6 Quattro, and 2019 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.