Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture KW "498 488" - Not availableBMW - 3 (E46, WB), 5 (E39, F10, WB), X3, 7 (F01, F02, F03), 1, 6, X5, Z4, X1