Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Triscan "8845 28014" - Not availablePEUGEOT - 405, 406, 306, 106, Boxer; CITROËN - ZX, Xsara; FIAT - Ducato, Ulysse