Visually/physically inspect the following conditions:

▶ Exhaust system between HO2S and Three way catalyst for air leakage, restriction and damage.

▶ Damage, and for loose or missing hardware:

Was a problem found in any of the above areas?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Rear HO2S Inspection " procedure.

Visually/physically inspect the rear HO2S for the following conditions:

▶ Ensure that the HO2S is securely installed.(Pigtail and wiring harness not making contact with the exhaust pipe)

▶ Check for corrosion on terminals

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

▶ Any road damage

Was a problem found in any of the above areas?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "TWC Inspection " procedure.

Visually/physically inspect the three-way catalyst(TWC) converter for the following damage:

▶ Severe discoloration caused by excessive temperature.

▶ Dents and holes

▶ Internal rattle caused by a damaged catalyst

Also, ensure that the TWC is a proper original equipment manufacturer part.

Was a problem found?

	▶ Replace TWC and go to "Verification of Vehicle Repair" procedure.
	▶ Check for poor connection between PCM/ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.