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2008 GMC Acadia Lean and rich

Tiny
JONBOY1
  • MEMBER
  • 2008 GMC ACADIA
P0174 and P0171
Thursday, July 2nd, 2015 AT 6:24 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Those are lean codes. They mean that the computer has reached it's adaptive limits trying to correct a lean condition. The most common cause is vacuum leaks.
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Thursday, July 2nd, 2015 AT 6:45 PM
Tiny
HUNGTX
  • MEMBER
  • 1 POST
I have had this same code after replaced spark plugs and forgot to hook a vacuum line back in; especially the one on the back near cylinder or spark plug # 1 (first spark plug on back bank)
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Monday, October 30th, 2017 AT 8:42 AM

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