Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Heater Current Test
- The PCM detects that the affected HO2S Heater Current parameter is more than 1.375 amps or less than 0.25 amps.
- The above condition is met for 10 seconds.
OR
Heater Resistance Test
The PCM detects that the affected HO2S heater calculated resistance is not within an expected range at engine start-up.