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.
