Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BAPMIC "BF0426110355" - Not availableBMW - 5 (E39, WB), 6, 3, 1, X3; AUDI - A4, A3; ALFA ROMEO - 159, Giulietta