Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
- Ignition ON, observe the DTC information with a scan tool. Verify no HO2S heater DTCs are set.
- If a HO2S heater DTC is set, refer to DTC P0030-P0032, P0036-P0038, P0053, P0054, P0135, or P0141 (LUW)
- Allow the engine to reach operating temperature.
- Verify none of the following conditions exist:
- Lean or rich fuel injectors, refer to DTC P0171 or P2097 (LUW) , and DTC P0172 or P2096 (LUW)
- Water intrusion in the HO2S harness connector
- Low or high fuel system pressure, refer to Fuel System Diagnosis
- Fuel that is contaminated, refer to Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks
- Engine vacuum leaks
- Engine oil consumptions, refer to Oil Consumption Diagnosis
- Engine coolant consumption, refer to Symptoms - Engine Cooling
- If you find any of the above conditions, repair as necessary.
- If all conditions test normal, test or replace the HO2S.
- Operate the vehicle within the conditions for running the DTC. Or operate the vehicle within the conditions that you observed from the freeze frame/failure records data.