Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Vemo "V42-76-0013" - Not availablePEUGEOT - 405, 406, 306, 407, Boxer; CITROËN - ZX, Xsara; FIAT - Ducato, Ulysse