Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Mobiletron "OS-B463P" - Not availablePEUGEOT - 206, 1007, 308, 207, 5008; CITROËN - Xsara, C4; MINI - Cooper, Clubman