2016 Yukon Denali short term fuel trim is -200

MidWestUsa

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Jan 18, 2022
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Vehicle
2016 GMC Yukon XL Denali
172k miles (New GM engine installed at 83K miles)
Normal idle, normal running
Highway average 18-20 miles/Gallon
City average 14-16 miles/Gallon


I was having P0430 code since last 50k miles , changed O2 sensor on bank 1 still same, recently friend came over connected his scanner where it shows short & long term fuel trim 200. Assuming t idle it supposed to be close to 0 (negative or positive)

Short term Fuel Trim bank 1 = -200%
Short term Fuel Trim Bank 2 = -200%
Long term Fuel Trim bank 1 = -204%
Long Term Fuel Trim Bank 2 = -203%

Please advise, what to do ?

Thanks
 


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