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System too lean on bank one code

Tiny
FORDSTANG331
  • MEMBER
  • 2013 VOLKSWAGEN CC
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
Recently the check engine light turned on for code. Looking at live data looks like long term fuel trim is very high hovering between 30 and 50 percent most of the time while driving and at idle. All other numbers seem fine except my MAF might be reading low, anywhere between 0.3 lb to 1.5 lb. What should my next step be and any opinion on possible issue?
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Saturday, March 26th, 2022 AT 6:17 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If you have a lean code, it could be the result of an engine vacuum leak or low fuel pressure. The easiest thing to check is for a vacuum leak.

Here is a link that explains how it's done:

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

Start with that and let me know the results.

Take care,

Joe
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Saturday, March 26th, 2022 AT 1:02 PM

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