Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Verify none of the following conditions exist:
- Lean or rich fuel injectors-Refer to Fuel Injector Diagnosis (w/J39021 or w/Tech 2) or Fuel Injector Diagnosis (w/CH47976)
- Water intrusion in the B52 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 (with Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks near the B52 HO2S
- Engine vacuum leaks
- Engine oil consumption-Refer to Oil Consumption Diagnosis
- Engine coolant consumption-Refer to Loss of Coolant
- If you find any of the above conditions, repair as necessary.
- If all conditions test normal, test or replace the appropriate B52 HO2S.