Notifications
Clear all
0
13/09/2023 11:38 am
Topic starter
Hey Scotty, I’ve got a couple codes I need help fixing. The codes are P0171 and P0174. The check engine light turns on and off randomly. Any advice?
2007 GMC Yukon Denali
6.2L V8 230,000MI.
Automatic
1 Answer
3
13/09/2023 12:13 pm
The two codes above indicate both cylinder banks are detecting a lean condition. The following below indicates where to start in the troubleshooting:
.
https://www.obd-codes.com/p0171
.
Go through the low hanging fruit items in that link first. If those don’t pan out, then look for a vacuum leak, you can use a smoke machine to find the source of the leak. Scotty has a video how to do this if you search on his YouTube channel.
