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Home >> Kia >> 2005 >> Rio Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures >> DTC Troubleshooting >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Inspection/Repair >> System Inspection >> Rear HO2S Inspection

Rear HO2S Inspection

  1. 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.
  2. Was a problem found in any of the above areas?

    YES

    1. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO

    1. Go to "TWC INSPECTION " procedure.
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