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Home >> Kia >> 2007 >> Rio Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures (2 Of 2) >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> 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 

      NO