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

Exhaust system between HO2S and Three way catalyst for air leakage

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.