Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Gebe "9 7075 1" - Not availableBMW - 3 (E91, E92), 5, 1 (E81, E87), X3, 6, Z4, X5, X1, 7 (E65, E66, E67)