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Home › Kia › 2009 › Rio Base, Standard › Repair and Diagnosis › Engine Performance › System › DTC Troubleshooting Procedures (2 Of 2) › DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) › Monitor Scan Tool Data

Monitor Scan Tool Data

  1. Connect scan tool to Data Link Connector (DLC).
  2. Warm up the engine to normal operating temperature.
  3. Monitor the "B1S1 and B1S2" parameters on the scan tool.
    Fig 1: Monitoring B1S1 And B1S2 Parameters On Scan Tool
    G04862234Courtesy of KIA MOTORS AMERICA, INC.
  4. Are the parameters displayed correctly?

    YES 

    • Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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