Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The PCM detects that the HO2S 1 parameter is more than 700 mV and the HO2S 2 parameter is less than 399 mV for 9.5 seconds.