2002 Ford Windstar Engine light cod PO-0171, po-0174

  • 6 CYL
  • 2WD
  • 123,000 MILES
Heed help
On mine 2002 ford Windstar the engine light comes on.I did check the troble cods with OBD-2 reader
It is two coder system lean bank-1, and system lean bank-2. Cods PO 0171and Po0174.I did erease the cods and run for little bet.I think afterI fill up the fuel tank the light comes on. The van runs fine but it bags me.
Thank you for any help
Do you
have the same problem?
Monday, February 16th, 2009 AT 8:08 PM

1 Reply

2002 Ford Windstar Engine light cod PO-0171, po-0174

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)

* TIP: On many Fords, a P0171 and/or P0174 Lean Code may sometimes appear because of a bad Differential Pressure Sensor (DPFE). This sensor monitors EGR flow, and is located on the engine near the EGR valve. There are two hoses that connect the sensor to the tube that runs from the exhaust manifold to the EGR valve. The sensor misreads EGR flow and the computer increases EGR which has a leaning effect on the fuel mixture. The fix is to replace the DPFE sensor.
Was this
Monday, February 16th, 2009 AT 8:17 PM

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