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Home >> Kia >> 2017 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 3) (PHEV) >> DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1) >> System Inspection >> Three-Way Catalyst Converter Inspection

Three-Way Catalyst Converter Inspection

  1. Refer to INTAKE AND EXHAUST SYSTEM (PHEV) and visually and/or physically inspect following conditions;
    • Severe discoloration caused by excessive temperature.
    • Dents and holes.
    • Internal rattle caused by a damaged catalyst.
  2. Has any problems been found?

    YES 

    NO 

    • Go to "O2 Sensor Inspection" procedure below.