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Home >> Kia >> 2004 >> Sorento LX, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> Specifications >> Fuel System & Fault Isolation >> DTC Troubleshooting Procedures >> DTC P0421: Warm Up Catalyst Efficiency Below Threshold Bank 1 >> System Inspection

System Inspection

Check for Leakage 

  1. Check that there is leakage between exhaust manifold and rear HO2S.
  2. Is there a problem?

    YES

    1. Repair or replace it. Then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO

    1. Go to "COMPONENT INSPECTION " procedure.