Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture NPS "DOX-1568" - Not availableOPEL - Vectra, Astra, Corsa C, Meriva A, Signum; VAUXHALL - Astra, Vectra; SAAB - 9-3