Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture INTERMOTOR "64649" - Not availableCITROËN - Xsara, C4, Saxo, C8, C3; PEUGEOT - 206, 1007; FIAT - Ulysse, Ducato