Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Sando "SSN70T01.1" - Not availablePEUGEOT - 306, 406, Partner, 206, 106; CITROËN - Xsara, Xantia, Saxo, Berlingo, C5