GM Service Manual Online
For 1990-2009 cars only
Makes
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GMC_Truck
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2009
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Yukon XL - 4WD
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Preface
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Dangers, Warnings, and Cautions
🢒 Heated Oxygen Sensor Resistance Learn Reset Caution
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.