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Home >> Genesis >> 2019 >> G70 3.3T Design, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 3.3L (2 Of 6) >> DTC P0139-00: O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) >> Component Inspection >> Check HO2S
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Check HO2S

  1. Visually/physically inspect the following conditions:
    • Ensure that the sensor is securely installed.
    • Check for corrosion on terminals
    • Check for damage of wiring harness
    • Repair as necessary and go to next step
  2. Warm up the engine to normal operating temperature and let it idle.
  3. Connect GDS and monitor the O2 SNSR VOL.-B1/S2 parameter on the GDS data list.

    Specification:  Above 0.7V at idle

  4. Is sensor data near the specified value?

    YES 

    • Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Check HO2S for contamination, deterioration, or damage. Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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