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Home >> Geo >> 1997 >> Metro Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation 1.0 & 1.3L >> Computerized Engine Controls >> Input Devices >> Heated Oxygen Sensor 2 (HO2S 2)
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Heated Oxygen Sensor 2 (HO2S 2)

HO2S 2 is mounted just after warm-up 3-way catalytic converter (WU-TWC). HO2S 2 operates similar to HO2S 1 and is used by PCM to monitor catalyst efficiency. HO2S 2 is normal when its activity appears lazy or inactive.