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Home › Geo › 1995 › Metro Base, 4D Sedan, Standard › Repair and Diagnosis (Single Page) › Engine Performance › Theory and Operation › Engine Controls - Theory & Operation - 1.3L 4-CYL › Computerized Engine Controls › Input Devices › Sub-Oxygen (Sub-O2S) Sensor

Sub-Oxygen (Sub-O2S) Sensor

Sub-O2S sensor checks oxygen level in exhaust after WU-TWC and sends reference signal to ECM. This provides a more precise fuel injector control.