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Home >> Kia >> 2005 >> Amanti >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures (2 Of 2) >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Monitor SCANTOOL Data

Monitor SCANTOOL Data

  1. Ignition "OFF"
  2. Connect Scantool and Engine "ON"
  3. Monitor the HO2S parameters and signal waveform on scantool.
    Fig 1: Monitor Scantool Data
    G03876713Courtesy of KIA MOTORS AMERICA, INC.
  4. Are those HO2S1 and HO2S2 within specifications?

    Yes 

    • Fault is intermittent caused by poor contact in the sensor' s and/or PCM' s connector or was repaired and 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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