Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BAPMIC "BACB12-741079" - Not availableBMW - 3 (E91, E92), 5, 1 (E81, E87), 6, X3, X1, 7 (E65, E66, E67), X5, Z4, X6