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CHECK ENGINE LIGHT CODE PO171

2007 CHEVROLET COBALT
29,000 MILES • 2.2L • FWD • AUTOMATIC
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MAILIBU1955
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  • 76 POSTS
What is the most likely the cause for a lean condition? Car operates nicely. Gas mileage has dropped since light came on. Was about thirty eight mpg on the highway. Now it is about twenty eight mpg. Thanks in advance for your help.

Nov 16, 2016 at 9:35 AM
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CJ MEDEVAC
  • ✓Experienced Mechanic
  • 11,000 POSTS
The most likely cause of a lean condition is "too much air", normally a vacuum leak.

The Medic
Nov 16, 2016 at 11:11 AM
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MAILIBU1955
  • MEMBER
  • 76 POSTS
There is not much for vacuum lines on this engine. I have made a visual check and I can see nothing that would cause code P0171. Do you know of a particular area to look? I do not believe it is to complicated or serious. It is just to know where the most likely leak is. I need the light out for sate inspection, plus my lost gas mileage. Thanks
Nov 17, 2016 at 7:14 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check fuel pressure with a gauge may be low autoparts rent it. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Nov 17, 2016 at 8:12 AM
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