Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture LUCAS "LEB5267" - Not availableOPEL - Astra, Insignia A, Corsa, Vectra C, Zafira; VAUXHALL - Corsa, Astra; SAAB - 9-5