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Home >> Hummer >> 2009 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Controls And Fuel - 3.7L - Introduction) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Sensor 1 >> Special Tools >> Notes
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Special Tools: Notes

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J-39194-B:  Heated Oxygen Sensor Wrench

CAUTION: When replacing the HO2S perform the following:
  • A code clear with a scan tool, regardless of whether or not a DTC is set
  • HO2S heater resistance learn reset with a scan tool, where available

Perform the above in order to reset the HO2S resistance learned value and avoid possible HO2S failure.