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Home >> Subaru >> 1997 >> Legacy Postal >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Front And Rear Oxygen Sensors (O2S)

Front And Rear Oxygen Sensors (O2S)

Sensors generate voltage according to exhaust gas oxygen content. Signal voltage increases when oxygen content is low (rich), and decreases when oxygen content is high (lean). ECM controls air/fuel ratio based on voltage generated.

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