Circuit/System Testing (w/o LLT)
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that none of the following conditions exist:
- Lean or rich fuel injectors-Refer to Fuel Injector Solenoid Coil Test (w/o LLT) or Fuel Injector Solenoid Coil Test (w/LLT) .
- Water intrusion in the HO2S harness connector
- HO2S wiring harness damage
- Incorrect RTV sealant
- 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 (w/o Special Tool) .
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks near the HO2S
- Engine vacuum leaks
- Engine oil consumption
- Engine coolant consumption
- If you find any of the above conditions, repair as necessary.
- If all conditions test normal, replace the appropriate HO2S.