Conditions For Setting DTC
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
PCM detects that the affected HO2S heater current is less than 0.22 amps or more than 1.56 amps for more than 200 seconds.