Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture RECOFICIAL "CSL2908" - Not availableOPEL - Corsa C, Signum, Meriva A, Tigra Twintop, Vectra; SAAB - 9-3; FIAT - Croma