Circuit/System Testing
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that none of the following conditions exist:
- Inspect the HO2S 1 for being secure
- Lean or rich fuel injectors-Refer to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2
- Water intrusion in the HO2S harness connector
- HO2S wiring harness damage
- Incorrect RTV sealant
- Incorrect fuel system pressure-Refer to Fuel System Diagnosis
- Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (w/ Special Tool)
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks near the HO2S-Refer to Exhaust Leakage
- 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, replace the HO2S 1.