Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BOSCH "0 281 004 640" - Not availableBMW - 3, 5 (F90, G30), 6 Gran Turismo, X5, 7 (G11, G12), X6, X7, X3, X4