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Home >> Hyundai >> 2014 >> Accent GLS, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC P0420: Catalyst System Efficiency below Threshold (Bank 1) >> System Inspection

System Inspection

  1. Visual check
    • Check air leakage at junction of HO2S or Catalyst converter.
    • Check looseness, poor connection, or damage.
  2. Is there something wrong?

    YES 

    NO