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Home >> Buick >> 2004 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (DTC P0030 To P0138) >> Engine Controls Diagnosis >> DTC P0138 >> Conditions for Setting the DTC

Conditions for Setting the DTC

The PCM detects that the HO2S 2 voltage is more than 920 mV for more than 2 minutes during Closed Loop operation.

OR

The PCM detects that the HO2S 2 voltage is more than 200 mV during decel fuel cut-off (DFCO) for more than 30 seconds.

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