Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Casco "CSN75T49AS" - Not availableBMW - 5, 3 (E30, EC), 8, Z1, 7; CITROËN - XM, Xantia; PEUGEOT - 605