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Here is a link to what I had found doing a Google search. http://www.aa1car.com/library/ford_lean_codes.htm Hope this helps. Check with AutoZone retailer in your region.

See "Related Questions" below for much more about this very serious. but somewhat easily fixed, problem with 1999-2003 Windstar 3.8l engines.

Includes links to very detailed instructions on what the fix(es) are.

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Q: Where do you get explanations for Ford error codes you have 2 codes PO171 and PO174 what do they regard?
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Where do you get explanations for Ford WINDSTAR error codes you have 2 codes PO171 and PO174 what do they regard?

See "Related Questions" below for much more about this very serious. but somewhat easily fixed, problem with 1999-2003 Windstar 3.8l engines.Includes links to very detailed instructions on what the fix(es) are.


Your ford ranger runs rough and you have engine codes po174 and po171 please help?

leaking intake gaskets...


What is po174 and po171 dtc codes on a f250 v10 Triton?

P0171, system too lean (bank 1). P0174, system too lean (bank 2). Start with checking for a vacuum leak.


What if 2003 Yukon keeps getting PO171 and PO174 codes Unlikely both or all 4 oxy sensors are bad?

Have you had your 4 oxygen sensors replaced? It turns out when they replaced my oxygen sensors, they were after market parts so the service engine light did not come and gave codes even though they were replaced.


IF there is no PVC valve on 98 ford tarus 24 valve dohc v6 engine what do you think causes codes PO171 PO174?

everyone says po171 and npo174 are map sensor problems, i do not think so, the egr pressure sensor collects vaccum and tells computer about the egr , what i am finding ,especially in winter, the 2 hoses going to the pressure sensor get full of crud and the sensor cant read anymore.Today i found a 1997 ranger with po171 and po174 codes ,the hoses were fine but ice had built up inside the knozles of the egr valve pressure sensor causing it not to read.check hoses and look for vaccum leaks first. I concur with the vacuum leak. To find, spray carb cleaner around all suspect hoses and manifold areas with engine at idle. When the idle speed increases, you have found the vacuum leak!


1998 Ford Ranger oxygen sensors go out every 3 months puts out codes po171 po174 each time what could be causing sensors to go out?

It's important to buy genuine Ford parts. If you are not, this is probably the reason it continues. Also, check the reader on your mass air sensor (it's a wire). If it has crud on it, it will tell the engine that there is not as much air going through it then there really is and the motor will run lean.


What are possible reasons for error codes po171 fuel trim system lean bank 1 and po174 fuel trim system lean bank 2 on a 2000 Nissan maxima?

from what i have experienced check the MAF sensor. you should check your o2 sensors also could be multiple things . but o2 sensors are a great place to start yes he is correct. however the maf or fuel filter or vacuum leak.. not o2s usually


Obdh fault codes po171 system too lean bank1?

i please the engine is not running good and if you accelerate the engine is not accelerate and the code is p0171


How bad is a P0343 and a P0171 codes for a 2000 kia sportage is this an easy fix and will be expensive?

po343 is camshaft sensor 1 bad and po171 is bank1 sensor bad, in English po343 cam sensor is mounted on back of engine and hard to get to, the po171 is bank 1 o2 sensor easy to replace.


How do you use chaotic card codes?

Try reading the card itself. They usually come with explanations.


What would you do to fix obd2 codes p0171 and p0174 on a 2003 ford explorer?

here are the meanings of the following codes, po171-system too lean(bank 1) po174-system too lean (bank 2). ok the fix could be the following, maf sensor may need to be cleaned. you can go to any auto parts store and buy maf cleaner,but follow instructions on can. could be air leak in air intake hose to air cleaner or an exhaust restriction. the codes are the same but for each bank. please let me know the outcome carl, when cleaning mass airflow sensor, do not touch any part of the inside of it or it will go bad and the sensors are not that cheap! so be carefull when taking off maff sensor to clean it.


Where do you get explanations for a 2000 mercury sable codes 2 codes P171 and P174 what do they regard?

These indicate the 02 sensor for both bank 1 & 2 are reading 'lead condition'. This is very similar to a common problem with the 1999-2003 Windstars with 3.8l engines - there's an intake manifold leak, that allow air to get into the engine that the computer did not know about and measure. See "Related Questions" below for more about that problem, as I expect it's very similar.