Conditions For Setting DTC
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
HO2S 2 voltage remains within 150 millivolts of the bias voltage, about 450 millivolts, for a longer amount of time than necessary. The amount of time ranges between 100-130 seconds depending on ECT at start-up and average Mass Airflow (MAF) since start-up.