Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture RIDEX "3922L0108P" - Not availableOPEL - Astra, Agila, Corsa, Omega B, Vectra C; CHEVROLET - Cruze, Trax; SAAB - 9-5