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My 99 ford is having problems with egr valve, losing power check engine light wantgo off. Also autozone checked it and it says egr system is detected little flow on the egr system. What can I do?

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Replace EGR valve.

Posted on Mar 20, 2011


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2 Answers

Where is the egr valve on a 99 Ford expedition

The EGR valve is in a very difficult spot to work on. If the EGR is bad it will set off the check engine light and make the vehicle run rough or stall at idle. It really doesn't make it run rough while driving or accelerating. What are the conditions when the car runs rough?

Mar 01, 2014 | 1999 Ford Expedition

1 Answer

96 cutlass supreme will not pass emission in ut. what should I do? KOER failed, trouble code po401

cleanout egr valve and troutle body . Or replace egr with new one, clean, check vacumm lines , check for clogged check , depending on modle of car you can pippoint problem as some have a common part problem depeding with make of car. But all have to do with exaust system. Insufficient flow exaust flow. Im not an expert, all I know it is related to this, I have it myself so im googling it.

Ford EGR valve

The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. Read more how the EGR system works below. What could cause the code P0401 - clogged or restricted EGR passages
- faulty EGR valve
- EGR valve stuck closed
- problems with the DPFE sensor (Ford)
- problems with hoses to the DPFE sensor (Ford)
- problem with the EGR vacuum switching valve (Toyota)
- clogged catalytic converter
- carboned up EGR temperature sensor
- vacuum supply issues at the vacuum-operated EGR valve
- electrical problems with the EGR valve control circuit
- engine computer problems
helpful website helps you with pinpoint and sou;ution related to auto make and model shows you most common cause of code reading.

Apr 16, 2013 | Cars & Trucks

2 Answers

Check engine light code P0401 98 Ford expedition

OBD-II Trouble Code P0401 - Insufficient EGR Flow

EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Check it and keep us updated. Hope this helps (remember to rating this free answer).

Oct 13, 2011 | 1998 Ford Expedition

1 Answer

My sister 2002 ford explorer sport trac check engine light came on and she took here vehicle to autozone to have it checked and they gave here a paper saying troubleshooting p1400 what is this?? and how do...

P1400 DPF EGR Sensor
Circuit Low Voltage Detected

I understand what the valve does, but
don't know exactly where to have you look
for it, or if it really failed without testing it

If you want to chance just replacing it, like
everyone seems to do,follow the vacuum
hoses away from the EGR Valve, and you should
find a small sensor in the vauum hoses with
a wire connector on it.

Mar 16, 2011 | 2002 Ford Explorer

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

    Check engine code 2001 ford taurus p0401

    usually caused by clogging or bad valve. Valve can fail by clogging, torn diaphram, or bad/loose vacuum actuation hose.

    Exhaust gas recirculation (EGR) system - insufficient flow detected

    Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM

    Your EGR valve should be on top of the engine in the front between the intake manifold and the pulleys. It looks something like this:

    First, make sure the vacuum hose is good and run it down to where it connects to the intake manifold to check for any leaks. If that's good and you want to get your hands dirty, take the valve off and see if it's clogged. clean it and see if you can actuate it with vacuum (put a vacuum hose on it, ****, and see if it will open. Also, look to see if there is gunk in the line and intake where it connects. Clean out anything you can with carb cleaner.
    If you can get it unclogged and the valve is working, put the valve back on with a new gasket, else buy a new one ($40 at autozone :o( ). If you solve the issue, the engine light should clear after a couple hours of driving. OK?

    Oct 16, 2010 | 2001 Ford Taurus

    1 Answer

    1994 Ford Probe GT 2.5L V6 Engine check light comes on at around 80kmh and engine seems to lose power. Any ideas what may be causing this? MAP sensor? EGR? MAS air flow?

    most likely you have a problem with your vacuum system. the check engine light is mainly for emission problems. it could the MAS airflow sensor as well though...

    Mar 16, 2010 | 1994 Ford Probe

    1 Answer

    01 Ford Expedition. Check Engine light and failed Smog check.

    whoever installed the egr valve, if it wasnt you, just cleared the engine codes, thus giving you this problem once again. Get it scanned at autozone, and go from there.

    May 18, 2009 | 2001 Ford Expedition

    2 Answers

    How do you clean the EGR valve on a 99' Honda Civic?

    Pull vacuum on egr valve with engine idling and see if engine stumbles and tries to die until vacuum is released. If this DOES NOT happen the egr exhaust passage is plugged will need to remove egr valve assembly and remove carbon from passage into cylinder head.

    Mar 29, 2009 | 1999 Honda Civic

    1 Answer


    The EGR is one piece in a larger system. Most autozone type places only read the code and match it with a code sheet. This does not troubleshoot the entire system. It is possible the new egr valve you repaired actually is broken. But check the Vaccuum lines and hose around the valve, if broken or loose or even missing, this would cause the same problem. Find a friend or aquaintance with a snap-on style computer to pull up the exact data you need.

    Aug 01, 2008 | Ford Taurus Cars & Trucks

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