Question about 1996 Ford F150 Regular Cab

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Have a 99 ford ranger keep getting code po401 replacedegr valve, feedback senor, vacuum solenoid could it be mymass air senor gone bad keeps light on.

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The MAF sensor could affect the EGR valve but I would look at the MAP first. You may have an exhaust leak you don't know about. Unfortunately without looking at live data or doing component testing you will play the parts change game.
Some components can be tested by most part stores, so ask first.

Posted on May 05, 2010

Testimonial: "thanks lot having it check on thusday another mec said it migt be in the egr tubes. thanks again. i hope this fixes my truck good site to get some help. "


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How do I Fix a PO401 code for a 1997 Ford Explorera with a 5.0 engine

po401 is insufficient air flow from EGR valve. check the vacuum hoses from egr, if ok, remove or test the egr valve itself and try to clean it out. Good-Day! It may just be sticking, from carbon buildup.

Feb 16, 2015 | Ford Cars & Trucks

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P1504 trouble code on ranger truck

Hi Michael:
P1504 - Idle Air Control (IAC) Circuit Malfunction
This DTC is set when the PCM detects an electrical load failure on the IAC output circuit.

IAC circuit open
VPWR to IAC solenoid open
IAC circuit short to PWR
IAC circuit short to GND
Damaged IAC valve
Damaged PCM

The IAC solenoid resistance is from 6 to 13 ohms.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Oct 29, 2011 | 2001 Ford Ranger Regular Cab

1 Answer

Egr engine code po401 is on in my 1996 ford explorer ive changed my egr valve blow out the egr tube i replaced my egr selenoid as well can it be a bad catalystic converter im going to test dpfe sensor what...

Disconnect vacuum supply hose to EGR V.R. solenoid at the solenoid. Connect the vacuum supply hose to a vacuum gauge. Start engine and check the vacuum at idle. Is the supply vacuum greater than 10 in-Hg (34 kPa) ?

Jun 10, 2011 | Ford Explorer Cars & Trucks

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Po401 ive cleaned the egr & replaced the egr but i keep getting this code??

depending on your model, there may be a solenoid valve that turns the vacuum to the egr valve on. If the solenoid fails, the egr valve will not open. Follow the vacuum line on the egr valve--does it go to a solenoid valve? If yes, apply 12 volts directly to the solenoid blades to see if it clicks open. If it doesn't click, replace the solenoid.

Apr 09, 2011 | Chevrolet Lumina Cars & Trucks

1 Answer

Trble code PO401 and PO455 codes light up along with engine light on. one mechanic looked at it and said it needs a DPFE sensor. What is that and where is it? I can do the work if I know where it is. ...

Generic Codes:

P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0455 Evaporative Emission System Leak Detected (large leak)

  • Delta Pressure Feedback Electronic (DPFE) system sensor vacuum line

  • IDuralast/EGR Valve Pressure Sensor
    Part Number:
    btn-view-details.png Price: $44.99
    2 YR Notes: // IE does not support addEventListener var el = document.getElementById("add-to-cart-multibox01"); if (el.addEventListener) { el.addEventListener('click', preventDefaultBehavior, false); } else if (el.attachEvent) { el.attachEvent('onclick', preventDefaultBehavior); } if (typeof(addToCartBoxDefined) == "undefined") { addToCartBoxDefined = true; window.addEvent('domready', function(){ new MultiBox('mb-add-to-cart', {descClassName: 'multiBoxDesc'}); }); } --- When I searched Autozone's site for dpfe I found the above part, but I'm not sure if that's it. I would search for a large vacuum leak somewhere in the hoses, or check the part leading from the EGR to this part for leaks or cracks in the hoses, or the part itself. I didn't find a location for the part on's website. Find the EGR Valve and follow the vacuum lines to the dpfe sensor. Part Number:
    EGR2009 Duralast/EGR Vacuum Solenoid For your 2001 Ford Focus 2.0L MFI DOHC 4cyl Part Number:
    function linkImage(newLink){ var url = newLink.href; if (url.indexOf('prodImageURL') == -1) { newLink.href = url + "&prodImageURL=" + document.getElementById("enlargedImage").value; }else { newLink.href = url.substr(0 , url.indexOf('prodImageURL')) + "prodImageURL=" + document.getElementById("enlargedImage").value; } } function changeImage(filename) { document.getElementById("mainimage").src = filename + '2/'; document.getElementById("enlargedImage").value = filename; } /* */ Price: $29.99 --- Something to do with a large vacuum leak, I think, from a part that connects to the EGR Valve.

    Oct 26, 2010 | 2001 Ford Focus

    1 Answer

    I have a 99 Windstar 3.8L Keep getting DTC PO401 have replaced DPFE EGR Valve and EGR tube still keep getting Code PO401

    Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

    May 30, 2010 | 1999 Ford Windstar

    1 Answer

    Po401 and po420 (95 toyota previa Van super charged engine)

    Check for air leak into system after MAF.

    Check for

    vacuum leaks on intake manifold,

    the air tube between the air filter.

    intake manifold vacuum hose.

    clean throttle plate with Berryman carburator cleaner

    SEE sample picture HERE

    Check for loose or no connected vacuum hose(s).

    Take it for a test drive.

    Please rate my answer if it's useful to you.



    Sep 05, 2009 | 2001 Toyota Tacoma

    2 Answers

    My 2002 Ford Taurus will shutter and die when running the air conditioner and sitting idle at a stop sign or stop light. When I turn on the air conditioner the rpms will fluctuate up high above 2 and then...

    the idle air control valve is responsible for engine idle.
    this is a common failure on ford's. but I don't think yours is bad because it does idle high befor it dies.
    you stated you had codes p0171 and p0174 these are lean codes for bank one and two, you said you found a vacuum leak and repaired it, the vacuum leak was mostly likely the cause of the lean codes, however the pcm has calibrated the fueling stategy for this lean mixture, what you need to do is erase the KAM "keep alive memory" this is done by unhooking the negative battery cable for 60 seconds, this is the only way to erase the KAM the $6000.00 machine I use wont even do it.

    once the KAM is clean the computer will go into a relearn state and all operating values will be adjusted for the vehicles current condition, during this relearn session the vehicle may have some driveability issues (low or high idle, stalling, poor fuel economy) the relearn should complete within 10 minutes of idling and then 10 minutes of driving.

    good luck and keep me updated

    Jun 14, 2009 | 2002 Ford Taurus

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