Conditions For Running DTC

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The engine is operating on alternative fuel.
No AF ECM ECT DTCs are set.
The start-up engine coolant temperature is less than 91°F (33°C).
The engine has been operating for at least 5 seconds.
The average mass air flow is less than 35 grams per second.
The battery voltage is more than 8 volts.
All other AF ECM DTCs for this HO2S sensor have ran and passed.
This DTC has not tested this ignition cycle.
The AF ECM determines the HO2S was cold at ignition key ON. A cold HO2S is indicated when the average HO2S signal voltage is within the bias voltage range of 0.30 volt (300 mV) to 0.60 volt (600 mV) when the ignition is turned ON.