Circuit/System Verification

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Ignition ON.
Verify no HO2S heater DTCs are set.
- If a DTC is set
  Refer to DTC P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0053, P0054, P0056, P0057, P0058, P0059, P0060, P0135, P0141, P0155 or P0161 .
- Go to next step : If a DTC is not set
Verify none of the conditions listed below exist :
- Lean or rich fuel injectors - Refer to Fuel Injector Diagnosis .
- Water intrusion in the HO2S harness connector
- Low or high fuel system pressure - Refer to Fuel System Diagnosis .
- Fuel contamination - Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks - Refer to Exhaust Leakage .
- Engine vacuum leaks
- Engine oil consumption - Refer to Oil Consumption Diagnosis .
- Engine coolant consumption - Refer to Loss of Coolant (L86 L83)Loss of Coolant (L96) .
  - If any of the conditions exist
    Repair as necessary.
  - Go to next step : If none of the conditions exist
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  Test or replace the appropriate B52 Heated Oxygen Sensor.
- Go to next step : If the DTC does not set
All OK.