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?

YES

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO

▶ 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 ECM)

-Any road damage

Was a problem found in any of the above areas?

YES

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO

▶ 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?

YES

▶ Replace TWC and go to "Verification of Vehicle Repair" procedure

NO

▶ Check for poor connection between 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