Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture FREY "880613201" - Not availableBMW - X1, X2, 3, 5, 1, 4, 2, 6, X5, X4, X6; MINI - Cooper, Clubman, Countryman