SPONSORED LINKS

System Lean Bank 1 and 2 Codes?

Tiny
KEIKERMAN
  • MEMBER
  • 2001 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 105,000 MILES
The service engine soon light lit on my 2001 f-150 w/5.4 V8. I checked the code and it came up as a P0171 and P0174 (System Lean Bank 1 and 2 respectively). It also appears the when it warms up the RPMs tend to fluctuate. Thought it might be because the injectors need to be cleaned so I put a fuel additive in to get rid of any build up in the injectors and it appeared to improve the problem. The RPMs still fluctuate but not as bad. The truck does have a K&N Filter and Intake on it and have heard that sometimes it could cause the mass air flow sensor to get dirty and that this could be a cause of the problem. Is this possible, and could it be as simple as cleaning the Mass Air Flow Sensor?
SPONSORED LINKS
Saturday, December 29th, 2007 AT 12:59 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
Yes, you are on the right path, the MAF sensor is the #1 cause of this kind of problem, and you are right the KN filter will cause the MAF sensor to get dirty prematurely. Here are instructions in the images below on how to change it out to help fix the problem.

https://youtu.be/ueHWUF6F120?si=81hQki1BgtB8FyP0

The sensor is inside the air filter housing. Check out the images (below). Let us know if you need anything else.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, May 7th, 2024 AT 1:46 PM

Please login or register to post a reply.

Related Engine Lean Content

How To Fix an Engine Backfire
VIDEO
How To Fix an Engine Backfire
Instructional repair video
Lean Exhaust
GUIDE
Lean Exhaust
Common Misconception: When an engine misfires, the cylinder runs lean, not rich, this is because the air to fuel ratio favors air by 14x. Therefore, an engine must be...
VIEW MORE

Sponsored links