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Home >> Chevrolet >> 2000 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Heated Oxygen Sensor No. 2

Heated Oxygen Sensor No. 2

Heated Oxygen Sensor No. 2 (HO2S2) is mounted just after Warm-Up Three-Way Catalyst (WU-TWC). HO2S2 operates similar to HO2S1 and is used by PCM to monitor catalyst efficiency. HO2S2 is normal when its activity appears lazy or inactive.