Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Calorstat by Vernet "LS140359" - Not availableSAAB - 9-5, 900, 9000, 9-3; BMW - 3, 5; AUDI - A6, A4; PORSCHE - 911