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Check Engine light with code P0171?

Tiny
TASHA_01
  • MEMBER
  • 2014 CHEVROLET MALIBU
  • 2.5L
  • 2WD
  • AUTOMATIC
  • 78,700 MILES
I got an oil change yesterday and today my check engine light came on. I took it to two different auto shops, and both came back with the same code of P0171. I haven't noticed any issues other than it is making a lot of noise when I accelerate, even a little tap and it's revving like crazy. Thank you in advance!
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Monday, July 11th, 2022 AT 7:31 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

The code indicates there is a lean fuel mixture. Since you just had the oil changed, I suspect either the air filter box intake tube or a vacuum hose has been loosened and not properly installed causing a vacuum leak.

Take a look through this link. It explains how to locate and repair a vacuum leak. Try this and let me know the results.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Take care,

Joe
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Monday, July 11th, 2022 AT 9:52 PM

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