2008 GMC Acadia Lean and rich

2008 GMC ACADIA
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JONBOY1
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  • 1 POST
P0174 and P0171
Jul 2, 2015 at 6:24 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
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.
Jul 2, 2015 at 6:45 PM
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HUNGTX
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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)
Oct 30, 2017 at 8:42 AM
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