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2003 GMC Yukon Denali 6.0L MIL Lamp on
Posted to GM Driveability on 12/27/2007 10 Replies

After replacing the O2 sensors the cust. said the MIL lamp come on and then goes off when they drove it on the highway. Last time it come into the shop the MIL lamp was on and the code was reading P0171. I have checked for evac leaks leading to the intake.

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  Related Documents & Media  2003 GMC Yukon Denali

 
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car Vehicle Data

2003 GMC Yukon Denali

VIN N/A
Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)
Message Closed

car Vehicle Data

2003 GMC Yukon Denali

VIN N/A
Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)