Question about 2000 Ford Windstar

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My 2000 Windstar is giving check engine code P0171 & P0174. What are they?

I went and got a diagnostic test and the guy gave us the codes, but wouldn't tell us what they were. He speculated and told me to find them.
Gee what a bargain for 20 bucks!?!?!? HELP!!! I am still driving with the
light on!

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  • bbumpy Nov 03, 2008

    I have the same problem with the engine light being on. The tach fluctuates from 500-800 RPM at idle, almost to the point of stalling. I have to shift to neutral & feather the gas at traffic lights for fear of stalling. I was told the codes P0171 & P0174 indicated a lean fuel mixture in both banks. Probable cause is Mass Air Flow Sensor. I changed it but it didn't help. Possible cause is O2 Sensor. I haven't changed that yet. Does anyone have more insight into this problem that may prevent me from throwing more money at unnecessary fixes. As a side note, most big chain parts stores (Autozone, Advanced Auto, etc.) will do a code scan for free.

  • Anonymous Mar 11, 2009

    po171 system to lean bank 1 po174 system to lean bank 2

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I just got an diagnostic test on mine same year, they say lower intake manifold leak. code 171

Posted on Jun 04, 2009

Try this as it seems to be common solution.

Posted on Oct 22, 2008

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This sounds like a vacuum leak, which is very common on Windstars with the 3.8L engine. The problem is frequently with the intake manifold gaskets (there are two- upper & lower), and even in the bolts that hold the manifolds on. There are new bolts available.

Posted on Feb 07, 2009

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How to fix codes P0171 & P0174


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Is it usual to have both p0171 and p0174 codes report at same time


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Codes po171 po174 and 1569 2000 windstar


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Windstar 2000 3.8. Runs fine. Checked for codes and got p0171 and p0174. Cleaned the MAF sensor. Went to erase codes and found the there is a third one in there now. p0113. What is wrong?


The upper intake manifold gaskets and isolators (the bolts that hold the manifold down) leak and cause the p0171 and p0174. The reason they leak is due to a missing baffle in the front valve cover which allows some oil into the upper intake which swells the gaskets and wears them. The manifold gaskets and valve cover should be replaced. But before having this done check to see if the black plastic hose on the back of the rubber intake hose(between the throttle body and maf) has dislodged. This happens alot when a new air filter is installed and will cause the same codes.

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Ford windstar check engine light comes on after stopping when starting to get moving again shows p0171 & p0174 codes why??


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


Technical Description

System Too Lean (Bank 2)


What does that mean?

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.

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Thanks.


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Engine service light illuminated. Diagnostic revealed P0171 and P0174 what does that mean?


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p0171 system to lean - bank 1
p0174 system to lean - bank 2
Check for vacum leaks.

Nov 20, 2009 | 2000 Ford Windstar

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