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

Component Inspection

  1. Rear HO2S (B1S2) check.
    1. B1S2 visual check
      • Check assembling state of B1S2. (Check the interference between sensor wiring and exhaust pipe.)
      • Check corrosion, contamination, or damage on sensor terminal and connector.
    2. Is there something wrong?

      YES 

      NO 

      • Go to  2 "Catalyst converter check" procedure.
  2. Catalyst converter check.
    1. Catalyst converter visual check.
      • Check discoloration by over-heating.
      • Check deflection or crack (hole).
      • Check noise.
    2. Check whether the catalyst converter is genuine.
    3. Is there something wrong?

      YES 

      • Substitute with a known-good Catalyst Converter and check for proper operation. If the problem is corrected, replace Catalyst Converter and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      NO 

      • Substitute with a known-good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
      NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM/PCM.
      Before or after testing ECM/PCM on the vehicle, use this function to reuse the ECM/PCM.
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