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Home >> Hyundai >> 2012 >> Elantra GLS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) >> DTC P0420: Catalyst System Efficiency below Threshold (Bank 1) >> Inspection/Repair >> System Inspection >> Exhaust System Inspection

Exhaust System Inspection

  1. Visually/physically inspect the following conditions:
    • Exhaust system between HO2S and Three way catalyst for air leakage, restriction and damage.
    • Damage, and for loose or missing hardware:
  2. 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.

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