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Home >> Kia >> 2010 >> Rio Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC P0420: Catalyst System Efficiency below Threshold (Bank1) >> Inspection Repair >> System Inspection

System Inspection

  1. Exhaust gas system check
    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

      1. Repair as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      NO

      1. Go to "COMPONENT INSPECTION " procedure.
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