Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture KW "498 481" - Not availableBMW - 3 (E91, E92), 1, 5, 6, X3, Z4, 7, X5, X6, X1; MERCEDES-BENZ - E-Class, C-Class, SLK