Heater Resistance Test
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
For DTCs P0135 or P0141 the PCM detects that the affected HO2S heater calculated resistance is not within an expected range at engine start-up.
OR
Heater Current Test
- For DTC P0135, the PCM detects that the HO2S 1 heater current parameter is more than 2.99 amps or less than 0.80 amps.
- The above condition is met for 200 seconds.
OR
- For DTC P0141, the PCM detects that the HO2S 2 heater current parameter is more than 1.56 amps or less than 0.217 amps.
- The above condition is met for 200 seconds.