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david, Auto Service Technician
Category: Ford
Satisfied Customers: 1500
Experience:  Certified Master Technician,Certified in diesel & gasoline engines
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2001 Ford Windstar: 3.8L..V6..too lean bank 1..O2 sensors

Resolved Question:

I have a neighbor with a 2001 Ford Windstar with a 3.8L V6. He is getting a PO171 and PO174 (System Adaptive fuel too lean bank 1, System Adaptive fuel too lean bank 2).
Are these codes referring to the O2 sensors, if so, which ones? (Near the engine or near the converter(s)). Thanks!
Submitted: 10 years ago.
Category: Ford
Expert:  david replied 10 years ago.

thank you for the question hope this helps.

Well Anytime you get a p0171/p0174 code you are getting air into the intake that the computer does not "know" about. This is due to bad readings from the MAF or air entering the system after the MAF. this is not a bad 02 code.

Vacuum leak. Look for defective PCV valve grommet or hose, check all vacuum lines. If all OK, the next step is to check the intake manifold gasket for vacuum leaks you can do this with a smoke machine, or a good can or carb cleaner. the engine will bog down if you find a leak with carburetor cleaner.

to check the MAF remove the air intake tube were it goes into the engine and look to see if it has any build up on it. any build up of carbine will cause it to malfunction. remove and clean with carb cleaner. this a Colman problem with fords. in Meany cases you will need to replace the MAF sensor.

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