Question about 1998 Ford F150 Regular Cab

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1998 ford f150 with a p0401 code

The EGR Valve is less than a year old, the DPFE ia new, and i have clean the Throttle body twice and the P0401 code is still there. And the check engine light came when I change my Transmission. I had no check engine light before I change the transmission.

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Posted on Jan 02, 2017

ewashmidas
  • 362 Answers

SOURCE: 2002 ford focus p0401

Here is a list of possible causes for a PO401, hope this helps.

  • DPFE sensor signal circuit is shorted to ground
  • DPFE sensor VREF circuit is open between sensor and PCM
  • DPFE sensor downstream hose off or plugged
  • DPFE sensor hoses both off, loose or damaged
  • DPFE sensor hoses connected wrong (reversed)
  • EGR orifice tube is damaged or restricted
  • PCM has failed

Posted on Feb 10, 2009

polarcycle
  • 1392 Answers

SOURCE: 2002 Ford Escape (V6) P0401 P0402 nightmare

Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.

Posted on Jul 22, 2009

alicantecoli
  • 22156 Answers

SOURCE: Service engine soon light came

P0401....Exhaust Gas Recirculation Flow Insufficient Detected

best advice with the EGR valve problem is to make a gasket with a coca cola can and sel it off completely

Posted on May 04, 2011

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2 Answers

I need to know what the problem the p0401 what is the problem 1999 grand Victoria Ford 4.9


wow I wish ford could make a egr system that wouldn't fail as I've seen this one go a lot lately ! anyways the code is for insufficient flow in the egr system , this is a means to recirculate some of your exhaust back into your intake , as a means to reburn some of your excess fuel (emissions) , anyways it consists of a means to meter some of the exhaust , and control it (off/on) also to measure the amount that goes in , its part of the closed loop of the fuel inlet system , the fault code is specifically saying flow sensor cant detect any flow in the pipe , there can be a few causes for this including a bad flow sensor , all are from my opinion a poorly designed system (it doesn't self clean it's self ) as almost a guaranty every 60k miles your gonna have some problem with it

Feb 03, 2016 | Ford 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

Service engine soon light came on about two weeks ago... code P0401. Changed gas cap, egr valve and dpfe sensor. Also took throttle body off and cleaned with carb cleaner. Erased code aswell, light came...


P0401....Exhaust Gas Recirculation Flow Insufficient Detected

best advice with the EGR valve problem is to make a gasket with a coca cola can and sel it off completely

May 04, 2011 | Ford F-150 Cars & Trucks

1 Answer

Code p0401 i replaced egr tested omhs@voltage on all related parts @reset code still comes on ?


What have you replaced the EGR valve or the DPFE sensor. The valve usually never goes bad it is usually the DPFE sensor that is bad or the ports in the intake elbow that the valve is bolted to are plugged. If the DPFE tests good pull the elbow and clean the ports. Do you have a vacuum pump?

Dec 10, 2010 | 2000 Ford F150 Flareside SuperCab

1 Answer

2002 Mercury cugar P0401 and P1401


DTC 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.

Causes: 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

Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve


DTC P1401 - Differential Pressure Feedback Electronic Sensor circuit High Voltage

I think that you need a new DPFE; first check it, you could also have something restricted. There are ports in the throttle body that can cause this as well. Check THIS LINK.

Hope helps.

Nov 04, 2010 | Mercury Cougar Cars & Trucks

3 Answers

1998 ford escort code P0401 I need to know what this code is for. Thank You.


This code is an EGR code for insufficient amount of egr. It could be that the egr tube is clogged or the egr itself is bad or there is not enough vacuum to open the egr properly. There is also a sensor called the DPFE(differential pressure feedback egr) is faulty.

Jun 25, 2010 | 1998 Ford Explorer

3 Answers

Check engine light on 401


Should be the same as the Contour. Try these items, let me know.

go to www.contour.org a web site for contours, i got alot of info on
the old P0401 trouble code over there.. will cover your taurus as well
as the contours..... one is to clean the manifold by pulling off the
throttle valve body and pulling all the carbon deposits out of the
openings.. i had the P0401 on my 96 contur and changed out the EGR, the
EGR vacuum modulator and still have the problem code and will get to the
cleaning behind the throttle body when i get a chance to get to it....
been like this for about 2 yrs. now... no problems running the car, just
the light stays on... i can get it to go out by disconnecting the
battery but it comes back after two cycles in the car start up.....

Feb 24, 2010 | 2001 Ford Taurus

2 Answers

98 windstar p0401 error code


Best explanation...
http://www.obd-codes.com/p0401

Jan 20, 2010 | 1998 Ford Windstar

1 Answer

2002 Ford Escape (V6) P0401 P0402 nightmare


Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.

Jul 21, 2009 | 2001 Ford Escape

2 Answers

Engine light on in 2000 Dodge Grand Caravan - code P0401 What does that code mean?


it is your EGR Valve. 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.

Causes 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
Possible Solutions In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve
LOCATION:
drivers side of the engine bay, just under the intake manifold plenum where the throttle body bolts up! If you take the air snokel off you'll see it better! It has a remote mountted vaccum solenoid with a 2 wire connector going to it that you should be able to see near the throttle body.
Follow the hose from the solenoid down to the valve and you'll find it!

hopes this helps-------lebones

Jan 06, 2009 | Dodge Grand Caravan Cars & Trucks

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