Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BOGAP "P6119123" - Not availableCITROËN - C4, DS4, Berlingo, C5, DS3; PEUGEOT - 508, 3008 II SUV; DS - DS 3, DS 4