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0n a 02 ford windstar the ck engine lite comes on and shows a code p0171 & po174

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Those codes indicate the fuel/air mixture is too lean. (Not enough fuel or too much air). This can be a result of a vacuum leak or faulty pcv valve. Start with the simple things. Look at all the vacuum lines for disconnected, cracked or broken hoses.

Posted on Nov 10, 2014

Testimonial: "I replaced the pcv and the grommet all other lines look good codes still come back"


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02 ford windstar cel on code po171 po174 lean mixture both banks how to slove

Recommend check for a vacuum leak especially at the back of intake where all the vacuum hoses connect. If all the hose seem good then you will need to replace the intake plenum gaskets. Common problem on the Ford 3.8 liter engine.

Nov 07, 2014 | Ford Windstar Cars & Trucks

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Codes po171 and po174 0n a 2002 ford windstar\

It sounds like you running lean; too much air, not enough gas.
Go to these links to get some additional information:

  • P0171 System too Lean (Bank 1)
  • P0174 System too Lean (Bank 2)

    • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filtersmag-glass_10x10.gif can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
    • There could be a vacuum leak downstream of the MAF sensor.
    Possible Solutions

    Possible solutions include:

    • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
    • Inspect all vacuum and PCV hoses, replace if necessary
    • Check for a dirty fuel filter and proper fuel pressuremag-glass_10x10.gif

    Mar 02, 2011 | Ford Windstar Cars & Trucks

    1 Answer

    Codes po171 po174 and 1569 2000 windstar

    Possible intake gaskets are leaking.There is a bulletin for the p0171 and p0174.These are engine running lean codes.Not sure on the 1569 code.

    Dec 01, 2010 | 2000 Ford Windstar

    1 Answer

    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.



    Dec 17, 2009 | 2002 Ford Windstar Cargo

    1 Answer

    P1507 P0171 & P0174 error codes on 02 windstar

    p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks

    Aug 06, 2009 | Ford Windstar Cars & Trucks

    2 Answers

    2001 Ford Windstar, check engine light has been on for a while, but started flashing last night. It ran out of oil in 1 month's time. Brand new transmission 1 month ago, they told us that it had lean...

    if the light is flashing it most like hasly some sort of misfire or converter failure, p0171 and p0174 is lean bank 1 and 2, replace you upper and lower plenum gaskets, while they have they off have they replace your ignition coil, plugs and wires, windstars are known for 2 things, lean codes,(plenum gaskets) misfire(bad ignition coil)

    Jul 09, 2009 | 2001 Ford Windstar

    1 Answer

    Ford windstar OBD II code P1537/38, P0171 and P0420

    It could all be related.P1537/38 are the intake manifold runner controls are stuck open.They are controlled by vacuum solenoids.The P0171 is bank one of the engine is running lean,usually caused by a vacuum leak, P0420 is catalytic converter efficiency code. The computer monitors the switch rate of the front 02 sensors and compares it to the switch rate of the rear 02 sensors to tell if catalytic converter is doing its job. Now if the front 02 is not switching properly then this will cause this test to fail and set this code.
    Look on bottom section of the intake manifold at the back of engine(where tranny bolts up) you should see the vacuum motors there on the intake,these are the control motors for the intake manifold runners.Make sure the vacuum lines are hooked up and lines are not leaking. Also you will see a lever from it to intake make sure they move and are not binding.

    Mar 11, 2009 | 1996 Ford Windstar

    1 Answer

    Engine codes Po171 Po174 Po401

    The vast majotity of Ford vehicles with P0171 and P0174 codes are suffering with a vacuum leak. The biggest culprits are the hoses going to the PCV valve. The rubber deteriorates due to heat and oil fumes. Check the hoses and rubber elbows between the PCV valve and the intake manifold. Pay very close attention to the rubber elbows. They crack on the onside and can be hard to spot.

    May 20, 2008 | 2001 Ford Windstar

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