2015 Audi S4 Progressiv Before Catalytic Converter, Driver And Passenger S Oxygen Sensor, Engine Designation: CCBA, FI, Supercharged, GAS, Set Of 2, 5-Wire, 6 Cyl 3.0L
2005 Audi S4 Base Before Catalytic Converter, Driver And Passenger S Oxygen Sensor, Engine Designation: BHF, FI, Naturally Aspirated, GAS, Set Of 2, 5-Wire, 8 Cyl 4.2L