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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 >> Rear HO2S Inspection

Rear HO2S Inspection

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  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 PCM)
    • Any road damage
  2. Was a problem found in any of the above areas?

    YES 

    NO