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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) >> Exhaust System Inspection

Exhaust System Inspection

  1. Visually/physically inspect the following conditions :
    1. Exhaust system between HO2S and Three way catalyst for air leakage.
    2. Damage, and for loose or missing hardware:
  2. Was a problem found in any of the above areas?

    YES 

    NO