Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BOSCH "0 258 010 239" - Not availableBMW - 3, 5, 1, 4, X3, X5, X1, 6, Z4 Roadster, 2, 7, X4, X6