Conditions For Setting DTC

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

P0135 or P0155

The HO2S voltage remains within 150 mV of the start-up voltage for a predetermined amount of time, based on ECT and airflow.

P0141 or P0161

The HO2S voltage remains within 75 mV of the start-up voltage for a predetermined amount of time, based on ECT and air flow.