Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture NPS "DOX-1319" - Not availableBMW - 3, 8, 5, 7; PEUGEOT - 306, 405; CITROËN - ZX, Xantia; FIAT - Punto, Ducato