Upstream O2 Oxygen Sensor for Audi A8 Quattro S6 S7 2014-2018 RS7 2013-2018 4.0LApplication:Make Model Year Engine Engine Type Location NoteAudi A8 Quattro 2013-2018 V8 4.0L Turbocharged Upstream Cylinder 1 to 4Audi RS7 2014-2018 V8 4.0L Turbocharged Upstream Cylinder 1 to 4Audi S6 2013-2018 V8 4.0L Turbocharged Upstream Cylinder 1 to 4Audi S7 2013-2018 V8 4.0L Turbocharged Upstream Cylinder 1 to 4Audi S8 2013-2018 V8 4.0L Turbocharged Upstream Cylinder 1 to 4