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Home >> Geo >> 1992 >> Metro LSi, 2D Hatchback, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Sub-Oxygen (O2) Sensor (Calif. Prizm GSi)
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Sub-Oxygen (O2) Sensor (Calif. Prizm GSi)

Sub-oxygen sensor is mounted in exhaust system, where it contacts exhaust gases after the catalytic converter. The sub-oxygen sensor rechecks emission level after the catalytic converter and sends reference signal to ECM. This provides a more precise air/fuel ratio.