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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. For component locations, see Figure .

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