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The engine was running lean?

Tiny
ANONYMOUS
  • MEMBER
  • 2003 LINCOLN AVIATOR
  • 14,500 MILES
My check engine light came on. Was hesitating a little while idling. Took to dealership and they hooked a machine to my vehicle to run a check to see what it registered. He told me that the engine was running lean. Apparently the fuel is not running through at 100% or their is some air. He said someone in Service would have to do more checks. What can I do in the meantime or how to fix it? Is it safe to drive? He said it was unless I hear tapping sound. Thank you.
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Friday, October 26th, 2012 AT 3:55 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

There are several reasons for the vehicle to trigger a running lean code.
It could be for a vacuum leak, bad spark plugs, faulty mass air flow sensor, leak in the exhaust, defective oxygen sensor. It can even happen if there is a leak in the air intake boot.
The best course to action is to look at the possible trouble areas until you find the issue.

Here is a helpful article that covers all the basic issues and what to look for:

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Please let me know of any questions.
Thank you.
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Tuesday, September 28th, 2021 AT 8:50 PM

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