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Home >> Kia >> 2019 >> Optima S >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.4L (2 Of 6) (Except HEV) >> DTC P0139-00: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> System Inspection >> Visual Inspection
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Visual Inspection

  1. Refer to HEATED OXYGEN SENSOR (HO2S) "Appropriate Service Information" and visually and/or physically inspect following conditions;
    • Check exhaust system for an air leak.
    • Check for corrosion on terminals.
    • Check for damaged wiring.
    • Check for good ground for O2 sensor.
  2. Has any problems been found?

    YES 

    NO