Hi hope I can help.
P0171 mean bank 1 is to lean
P0174 means bank 2 is lean
You did not state what engine you have but by your codes you must have the V6 4.0.
These codes refer to a fuel issue. bank 1 and bank two represent each of your manifolds.
being you have a V6 you have 2 manifolds.
Each of your manifold have an O2 sensor in it. That's what is giving the lean reading.
This does not mean that you have bad O2 sensors.
They are just doing there job.
So you should check your fuel pressure with a gauge and make sure your pressure is correct.
It seams as your fuel pump maybe weak.
Hope this helps.
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Thank you urnuts73@ FixYa
Try this ->http://www.aa1car.com/library/ford_lean_codes.htm
SOURCE: Ford windstar check engine light comes on after
P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.
P0174 OBD-II Trouble Code
System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust. Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time. ----------- Thanks.
SOURCE: i am getting a code p0171 and p0174 on my 1999
P0171 is a LEAN code for cylinder bank 1
P0174 is a LEAN code for cylinder bank 2
That means your car is getting a lot of air and not enough fuel which will make the engine Misfire and rough idle. Well i can say check your mass air flow for any dirt in it and the EGR for any leaks. And also the fuel pump and the fuel lines or any restricted fuel filter. Good luck bro
System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
-----------
Thanks.
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