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.