Check engine light came on,obd2scanner error codes PO171 system too lean(bank1) & PO174 system too lean bank2)
Looks like ya need 2 o2 sensors
SOURCE: ford windstar codes po171 and
Try cleaning the MAF. Here is more info on the codes:
http://www.aa1car.com/library/ford_lean_codes.htm
SOURCE: Generic code PO171 system 2 lean bank 1 generic
This can be caused by a faulty mass air flow sensor
SOURCE: check engine light is on
Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks
SOURCE: 2003 Ford Expedition check engine light on .Codes PO171 & PO174
This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback
SOURCE: 2003 Ford Expedition check engine codes PO171 & PO174
You should be replacing all upstream oxygen sensors,
the ones at the inlet or pipe before the converter,on all
your vehicles at 100,000 miles
Go to Rock Auto.Com & buy two & install yourself
NTK 22060 $26.79 ea
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