2002 Ford F-250 smog codes

Tiny
PACIFICSURFER195125
  • MEMBER
  • 2002 FORD F-250
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
P0171 p0174 adaptive fuel running too lean
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Friday, September 25th, 2009 AT 2:48 PM

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Tiny
RASMATAZ
  • MEMBER
P0171/P0174

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Friday, September 25th, 2009 AT 2:50 PM

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