DTC P0133: Ho2S Circuit - Slow Response - Sensor 1: Description
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) continuously monitors the Heated Oxygen Sensor 1 (HO2S 1) activity for 100 seconds. During the monitor period, the PCM counts the number of times that the HO2S 1 switches from rich to lean and from lean to rich and adds the amount of time that the HO2S 1 took in order to complete all of the switches. With this information, you can determine an average time for all of the switches. If the average time to switch is too slow, a DTC P0133 will set. Do not attempt to repair the HO2S. Replace the entire HO2S if the following conditions exist:
- Damaged wiring.
- Damaged electrical connector.
- Damaged terminals.