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Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

The PCM detects that the HO2S 1 voltage is less than 78 mV, for more than 51 seconds.

Or

The PCM detects that the HO2S 1 voltage is less than 598 mV, during power enrichment (PE) mode, for more than 7.5 seconds.

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