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Home >> Hummer >> 2007 >> H3 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - Introduction (2 Of 2) >> Repair Instructions >> Heated Oxygen Sensor 1 Replacement >> Tools Required

Tools Required

J 39194-B  Heated Oxygen Sensor Wrench. See Special Tools .

NOTE: 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.
NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice .
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