Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture RIDEX "3922L0430P" - Not availableBMW - X1, X2, 3, 5, 4, 1, 2, 6, X5, X6, X4; MINI - Cooper, Clubman, Countryman