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Home >> Hyundai >> 2005 >> Elantra GLS, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System >> DTC Troubleshooting Procedures >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Rear Ho2S Inspection

Rear Ho2S Inspection

  1. Visually/physically inspect the rear HO2S for the following conditions:
    1. Ensure that the HO2S is securely installed.(Pigtail and wiring harness not making contact with the exhaust pipe)
    2. Check for corrosion on terminals.
    3. Check for terminal tension. (at the HO2S and at the PCM)
    4. Any road damage.
  2. Was a problem found in any of the above areas?

    YES 

    NO 

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