Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture OSSCA "40498" - Not availableBMW - 3 (F30, F80), 1, 4 (F32, F82), X4, 5, X3, 6, X1, 2; BMW (BRILLIANCE) - 5 Series