Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.

Ignition ON.
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 .
- If no HO2S heater DTC is set
Allow the engine to reach operating temperature, engine running.
Verify the scan tool HO2S Sensor 1 or 2 voltage parameters are between 50-1050 mV.
- If not between 50-1050 mV
  Refer to DTC P0133, P013A, P013B, P013E, P013F, P015A, P015B, P2270 or P2271 .
- If between 50-1 050 mV
Verify none of the following conditions exist:
- Lean or rich fuel injectors
- 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 any of the above conditions exist
  Repair as necessary.
- If none of the above conditions exist
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.
Verify the DTC does not set.
- If the DTC sets
  Replace the B52 Heated Oxygen Sensor.
- If the DTC does not set
All OK.