Conditions for Setting the DTC

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The HO2S has not shown the proper activity after a forced lean or rich state has been commanded for more than 25 seconds duration.
OR
The HO2S shows the proper activity, but the calculated temperature of the HO2S falls below 600°C (1,112°F) or exceeds 900°C (1,652°F), during 28 of 32 samples.