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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 125 (Engine Control System Diagnosis (1 Of 2) (HEV)) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> System Inspection >> Exhaust System Inspection

Exhaust System Inspection

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  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 

    NO