System too lean on bank one code

2013 VOLKSWAGEN CC
85,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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FORDSTANG331
  • MEMBER
  • 1 POST
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?
Mar 26, 2022 at 6:17 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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
Mar 26, 2022 at 1:02 PM
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