Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BOSCH "F 01R 00C 004" - Not availableMG - GT, MG 5, MG GS, MG HS; MG (SAIC) - 5, GS; ROEWE (SAIC) - 350