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 HO2S voltage remains within 150 mV of the bias voltage (about 450 mV) for a longer time than normal. The amount of time ranges between 42 seconds and 2 minutes.