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What is code : po125 for a ford focus, 2001 and code po401

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Posted on Jan 02, 2017

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SOURCE: ford explorer 2002 v-8 code po401 low flow on obd-2

Replacement engine put in with 51000 miles and now the engine light is on and the speedometer goes from 50 to 0 and then jerks

Posted on Aug 06, 2008

  • 76630 Answers

SOURCE: The engine light is on with my 2001 ford explorer sport.

this code indicates that the exhaust gas recirculation valve (EGR for short) is not flowing enough gas, this can be caused by a defective valve or a plugged EGR gas passage, the plugged passage in the intake is the more common problem.

Posted on Apr 06, 2009

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SOURCE: mercury sable 2001 duratec engine DOHC I get check engine light and diagnostic code PO401". Any suggestions?

Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.

Posted on May 30, 2009

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SOURCE: I am working on a 2001 ford expidition check

EGR problem, usually bad EGR valve, bad EGR sensor or even vacuum problem to EGR.

Posted on Jun 28, 2009

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SOURCE: 2001 Ford Focus radio code

Sometimes, the radio code is label, in back side of the radio; you need take off the radio for check it. Other times this code is in the last page from owners manual.

If you can't find it, maybe need call to the Ford dealer with your VIN number and they send to you (sometimes need pay for this service).

Hope helped.

Posted on Apr 24, 2010

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1 Answer

I have a ford windstar 2001 LX 3.8 i have the codes po401 po171 and po174

171 is a HEGO sensor unable to switch/ 174 is for HEGO sensor also.. 401 is insufficient EGR flow!! egr valve may be clogged or need replaced!!

Feb 26, 2015 | 2001 Ford Windstar

1 Answer

Code po125

code po125 refers to insufficient coolant temperature for closed loop fuel control causes ---wiring--cooling system---coolant thermostat--ECT sensor ---ECM. Check the level in the radiator. take it to a specialist mechanic for your car

May 25, 2013 | 2001 Ford Focus

1 Answer

2001 windstar have code po401

PO401 is a egr problem, low /no flow detected. Unfortunatly most of the time with the 3.8 engine is the ports in the intake manifold get clogged. So if testing reveles the egr valve is working and the dpfe sensor is reading between around .8 to 1.2 volts at idle your probably looking at taking all the plastic plenum parts off to clean the passages. This can be done without removing the wiper box abobe the plenum but you have to remove the iac and sneek the manifold our from the drivers side forward first.

Jul 11, 2012 | 2001 Ford Windstar

1 Answer

I have the code PO401 AND PO402 codes on my 2002 focus, any suggestions?

PO401: EGR insufficient flow detected
PO402: EGR excessive flow detected

A code P0402 most likely means one or more of the following has happened:

The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Feb 25, 2012 | 2002 Ford Focus

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

    Po125 01 cavalier

    Check the wiring around the Oxygen sensor.
    This error indicates the sensor is not sending the correct signal to the computer.
    It may be wiring or the sensor itself.

    Oct 17, 2009 | 2001 Chevrolet Cavalier

    2 Answers

    Mercury sable 2001 duratec engine DOHC I get check engine light and diagnostic code PO401". Any suggestions?

    Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.

    May 30, 2009 | 2001 Mercury Sable

    1 Answer

    2001 ford focus with engine light 0n

    Your DPFE sensor may need replacing.

    I had to change mine , the part cost around $200 and for me , my sensor was firewall mounted so it was easy to do myself, two screws,two vacuum hoses different sizes and three wires. I suggest doing research on line regarding the sensor and where it may be on your car. I have a 01 Focus se 2.0 spi.

    I am always telling people to obtain their own HAYNES repair manual due to the $$ that could be saved by doing some things yourself, or at least having some knowledge so some mechanics won't think you're an easy cash grab. Some mechanics tell me the book is **** but that is not true; it's always better to know how cold or hot the water is before jumping in....right.?!

    Mar 17, 2009 | 2000 Ford Focus

    1 Answer

    Ford focus with p0401

    PO401 is EGR flow insufficent. Replace the EGR valve.

    Feb 10, 2009 | 2000 Ford Focus

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