Check the exhaust system for an exhaust leak near the engine.

Was an exhaust leak found?

	▶ 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:

- Check for corrosion on terminals

- Check for terminal tension ( at the HO2S and at the PCM/ECM)

- 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.