Conditions For Setting DTC

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

The PCM monitors less than 55 lean-to-rich and rich-to-lean switches for this HO2S.
The HO2S voltage remains between 300-600 mV.
The conditions are present for 2 minutes after Closed Loop enable.