Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture VEGAZ "DLS-450" - Not availableBMW - 3, 1 (E81, E87), 5 (E39, F10, WB), 6, 7 (F01, F02, F03), X6, Z4, X1, X5, X3