2002 Ford F150 Diagnostic Codes 171/174

2002 FORD F-150
Avatar
MIKE KNOX
  • MEMBER
  • 1 POST
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?
Mar 31, 2008 at 11:24 AM
Avatar
SERVICE WRITER
  • ✓Experienced Mechanic
  • 9,123 POSTS
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.
Mar 31, 2008 at 11:36 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle