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Home >> Kia >> 2015 >> Forte EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) - 2.0L >> DTC P0139: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> Component Inspection

Component Inspection

  1. Replace the HO2S.
  2. Clear DTC with GDS.
  3. Start the engine and warm it up until the radiator fan comes on (more than at least 10 minutes).
  4. Drive at a steady speed between 45-55 mph (72-88 km/h) for 120 sec.
  1. Stop and then maintain idle state.
  2. Check if O2 sensor monitoring readiness is complete.
  3. Does the GDS show DTC P0139?

    YES 

    • Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
      NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM/PCM. Before or after testing ECM/PCM on the vehicle, use this function to reuse the ECM/PCM on the others

    NO 

    • Troubleshooting is finished.
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