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Home >> Subaru >> 2000 >> Outback Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Front & Rear Oxygen Sensors (O2S)
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Front & 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). PCM controls air/fuel ratio based on voltage generated.

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