Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Gebe "9 7073 1" - Not availableBMW - 3, 5, 1, 6, 7 (E65, E66, E67), X3, 4, X1, 2, X5; AUDI - R8