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Home >> Hyundai >> 2004 >> Elantra GLS, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> DTC Trouble Shooting Procedures >> DTC P0138: O2 Sensor Circuit High Input (Bank 1, Sensor 2) >> Inspection Procedures >> 3. Check HO2S Signal Waveform
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3. Check HO2S Signal Waveform

  1. Reconnect the HO2S and ECM connectors.
  2. Warm up the engine to normal operating temperature.
  3. Using a Hi-Scan (Pro), monitor the HO2S signal waveform.

Do the rear HO2S signals fluctuate between 0V and 1V? 

Yes: Proceed with ECM problem procedure.

No: Replace HO2S.

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