Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BAPMIC "BACB12-741065" - Not availableBMW - 3, 5 (E39, WB), 1, 7 (E65, WB), 6; AUDI - A4, TT; FORD - Galaxy