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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Engine Control System Diagnosis - 2.0L (1 Of 3) (Except HEV)) >> DTC P0139: O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) >> System Inspection >> Visual/Physical Inspection

Visual/Physical Inspection

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  1. Visually/physically inspect the following components:
    • Check for corrosion on terminals
    • Check for terminal tension (at the HO2S and at the PCM)
    • Check for damaged wiring
    • Check the HO2S ground circuit for a good connection
    • Check front and rear HO2S for connections being reversed
  2. Was a problem found in any of the above areas?

    YES 

    NO 

    • Go to next step below.