2002 Ford F-150 Diagnostic Codes 171/174

Tiny
MIKE KNOX
  • MEMBER
  • 2002 FORD F-150
Engine Performance problem
2002 Ford F150 Two Wheel Drive Automatic 92000 miles

I have rec'd these codes. Both indicate system too lean. What can be the cause and can I repair myself?
SPONSORED LINKS
Do you
have the same problem?
Yes
No
Monday, March 31st, 2008 AT 6:24 PM

1 Reply

Tiny
SERVICE WRITER
  • EXPERT
I have seen dirty MAF sensors cause this combination.

ALthough an air leak after the MAF such as an intake plenum gasket leak can cause this as well.

Try cleaning the MAF with electrical cleaner and let it dry. You can spray some carb cleaner around the intake and watch for an idle change.

IF nothing simple like this helps we can go into testing.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, March 31st, 2008 AT 6:36 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