Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture KW "498 489" - Not availableBMW - 5 (E39, WB), 3, X3, 6, X5, X6, 1, Z4, 7, X1; MERCEDES-BENZ - C-Class, GLC, G-Class