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Home >> Kia >> 2017 >> Forte5 SX, Automatic DCT Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 1.6L T (2 Of 3) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> DTC Inspection >> Monitor GDS Data
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Monitor GDS Data

  1. Connect GDS to DLC (Data Link Cable).
  2. Warm up the engine to normal operating temperature.
  3. Check the "Current Data  " about related DTC with GDS.
    Fig 1: Scantool Display - Acceleration
    G12153801Courtesy of KIA MOTORS AMERICA, INC.
    1. Can be determined by comparing the performance of the catalyst oxygen sensor 1 and 2.
  4. Are the parameters displayed correctly?

    YES 

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