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Home >> Kia >> 2020 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 6) (PHEV) >> DTC P0139-00: O2 Sensor Circuit Slow Response >> System Inspection >> Visual Inspection
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Visual Inspection

  1. Refer to "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