Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture VEGAZ "ULS-610" - Not availableBMW - 3 (E36, WB), 7, Z3, 5, 8; MERCEDES-BENZ - E-Class, S-Class; FIAT - Punto, Siena