Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture VEGAZ "ULS-336" - Not availableAUDI - A4, A3, TT, A6, A8; VW - Scirocco; MERCEDES-BENZ - C-Class, E-Class; BMW - 5, 7