Visually/physically inspect the following items:
- Vacuum hoses for splits, kinks and improper connections.
- Exhaust system between HO2S and Three way catalyst for air leakage
- EVAP system for leakage
- PCV hose for proper installation
Was a problem found in any of the above areas?
![]() | ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
![]() | ▶ Go to next step as below |
Visually/physically inspect the following items:
- Check for corrosion on terminals
- Check for terminal tension (at the HO2S and at the PCM)
- Check for damaged wiring
- Check the HO2S ground circuit for a good connection
- Check front and rear HO2S for connections being reversed.
Was a problem found in any of the above areas?
![]() | ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
![]() | ▶ Go to next step as below |
Visually/physically inspect the following items:
- Vacuum hoses for splits, kinks and improper connections.
- Exhaust system between HO2S and Three way catalyst for air leakage
- EVAP system for leakage
- PCV hose for proper installation
Was a problem found in any of the above areas?
![]() | ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
![]() | ▶ Go to next step as below |
Visually/physically inspect the following items:
- Ensure that the HO2S is securely installed.
- Check for corrosion on terminals
- Check for terminal tension ( at the HO2S and at the PCM)
- Check for damaged wiring
- Check the HO2S ground circuit for a good connection
Was a problem found in any of the above areas?
![]() | ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
![]() | ▶ Go to next step as below |