LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - Introduction >> Repair Instructions >> Heated Oxygen Sensor Replacement - Sensor 1 >> Special Tools >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Special Tools: Notes

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.