2002 Ford Taurus Diagnostic codes P0171 and P0174 System to

2002 FORD TAURUS
90,000 MILES • 6 CYL • FWD • AUTOMATIC
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CAPNJIM
  • MEMBER
  • 7 POSTS
Hi Guys,

I would appreciate anything you could tell me about what could cause code P0171 and P0174 (System Too Lean) on banks 1 and 2 on my daughter's V6 Taurus. I have donated before and received good advice.

Thanks,

Capnjim
Mar 19, 2010 at 12:32 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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RASMATAZ
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 75,992 POSTS
Hi capnjim, Welcome to 2carpros and TY for the donation

Lean condition: P0171/0174

Could be caused by one of the following:

Dirty or Inoperative Mass air flow sensor, an EGR valve that's leaking, fuel injectors dirty, low fuel pressure, pressure regulator leaking, PCV valve and vacuum leaks
Mar 19, 2010 at 2:34 PM
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