Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture DRiV "OZH074" - Not availablePEUGEOT - 306, 106, 406, Partner, 405; CITROËN - Xsara, Saxo; SAAB - 9-3, 9000