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Home › Hyundai › 2009 › Tucson GLS, Automatic › Repair and Diagnosis › Engine Performance › System › DTC Troubleshooting Procedures (2.0L) › Troubleshooting for DTC › P0138 O2 Sensor Circuit High Input (Bank 1/Sensor 2) › Component Inspection

Component Inspection

  1. Warm up the engine to normal operating temperature and check that HO2S signal is active.
  2. Connect Scantool and monitor the "O2 SNSR VOLT.(B1/S2)" parameter on the Scantool data list.

    Test Condition  : Engine "ON" & In Idle("Closed Loop")condition

    Specification  : Above 0.6V

    Fig 1: Oxygen Sensor Signal Waveform
    G06206388Courtesy of HYUNDAI MOTOR AMERICA

    Fig. 1) Normal value with idle after warm up : Above. 0.6V

    Open in signal circuit: Above. 0V

  3. Is sensor data near the specified value?

    YES 

    • Check for poor connection between PCM 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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