Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Gebe "9 7143 1" - Not availablePEUGEOT - 206, 207, 1007, Partner, Bipper; CITROËN - C3, C2; FIAT - Fiorino, Qubo