Question about 1998 Ford Ranger SuperCab

2 Answers

Check engine light with code p1401 - 1998 Ford Ranger SuperCab

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 691 Answers

Recirculation (EGR) valve codes. The Differential Pressure Feedback EGR (DPFE) sensors on these vehicles have a high failure rate. Ford now uses a redesigned DPFE sensor. In effect, since the failure rate is so high, if you get this code, replace the sensor and retest. When the DPFE Sensor starts failing, it gives the PCM bad information. The DPFE Sensor is less sensitive, and the PCM thinks less recirculated gas is being burned than is actually so. Trying to compensate, the PCM opens up the actuator too much. This excessive amount of EGR combined with the air coming in via the throttle body leans out the fuel mixture, causing a lean misfire, which is the "stumble" or "hesitation" that is common as the DPFE Sensor fails. The DPFE sensor in the Focus is not very robust, requiring frequent (every 30k miles or sometimes less) replacement or a work around. Note that complete DPFE sensor failure is a very slow process, and the check engine light won't come on until the DPFE sensor is pretty much done for. If you're experencing stumble or hesitation while cruising, and think that it might be related to DPFE sensor failure. If the stumble goes away, then your DPFE sensor is more than likely failing. Of course, replacement of the bad DPFE sensor is the official recommended fix for this problem.

Posted on Jul 29, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I wanted to add my experience, since this code has been hounding me for quite some time. I tried all of the usual fixes first of course.. Replaced the DPFE with one from a junkyard. That didn't work, code came back as soon as I cleared it. Broke down (figuratively, this never actually rendered my truck inoperable. Even when I had the DPFE sensor completely unplugged) and bought a new DPFE sensor, and those things aren't cheap for a 2000 2.5L. I think it set me back over $70. That still didn't fix it. After doing quite a bit more research, I found that the EGR system could get clogged with carbon build-up which has been known to trigger this code. Just to be completely safe, I replaced the EGR valve itself, the EGR tube, and cleaned the ports they connect to really well with carb cleaner. Reset the code, and bam right back on.

I had already visually inspected all of the wires, but since the code itself makes me think electrical I decided to go a bit further. I very gently tugged on the wires coming out of the harness that plugs into the DPFE sensor. One came out with absolutely no effort, and another came out fairly easily. I suppose this could explain why replacing the DPFE sensor "fixes" the problem temporarily for some people. Handling the harness when unplugging and plugging it in might give the wire just enough contact for a little while.

The parts store wanted over $30 for a new harness, so I went around at a junk yard until I found one in which I could tug all three wires fairly aggressively and they were in there really well. Unplugged the harness, cut off enough wire to splice it to my old wires, and the problem has been fixed ever since for $2. Well, at least I have a whole new EGR system now! I guess that can't be bad for mileage.

Posted on Sep 09, 2015


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 76846 Answers

SOURCE: My Check engine light comes on even after the

Ford:DTC P1401 Differential Pressure Feedback EGR Circuit High Input
did you do the pin point testes? a fault code only tell s the sensor signal has a problem, that can be the actual sensor or the connector, or the wiring or the powertrain control module, with this sesor you can also hook the hoses up wrong and excessive exhaust back pressure can cause this as well.

Posted on Nov 03, 2009

  • 169 Answers

SOURCE: Check engine light on showing a code of P1401

Hello! That DTC indicates a fault in the EGR temperature sensor. It is located on the intake side of the engine, between cylinders 3 & 4. See picture below. You should check for any loose connection, damaged connection or damaged wires. If none, it will need to be replaced.

Hope this helps and good luck! Thanks for using FixYa!

Posted on Oct 02, 2009

  • 2359 Answers

SOURCE: code P1401

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

Also remove carbon built up behind the EGR valve and the EGR passage tube.


Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.


EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.

Take it for a test drive.

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



Posted on Dec 19, 2009

  • 158 Answers

SOURCE: I have a hyundai accent 2002. The check engine

Diagnostic: "module Tank Leakage (DMTL) Failure"

Probale cause:

1) Open Or Short Circuit Condition

2) Poor Electrical Conection

3)Faulty DMTL Module Faulty

Read more: Call your service dept on the phone as I have heard they dont use the code...better call dealership for free and find out. Hoped I helped you in the right direction

Posted on Feb 23, 2011

  • 860 Answers

SOURCE: my car hundai accent 2002 gl shows check engine


Posted on Apr 25, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

3 Answers

What is this code p1401

it's call DPFE Sensor Differential Pressure Feedback EGR is located on top of engine square looking with the electrical connector so replace it with part no. 4U7Z-9J460-AA get it from the dealers parts dept. ok disconnect negative side of the battery after installing sensor put negative back on battery then restart let it run ok.

Jul 01, 2014 | 2000 Ford Focus

1 Answer

Check engine light comes code p1401

Code 1401 is for a problem with the EGR temp sensor. The sensor and circuits would need to be checked.

May 18, 2013 | Nissan Quest Cars & Trucks

1 Answer

Check engine light comes code p1401

Hi Abe, I'm glad to help!

P1401 is an EGR fault code: Differential Pressure Feedback EGR Circuit High Input. This can be caused by several things. EGR Valve is bad, Flow through the valve is restricted due to carbon build-up. Electrical connector OR wiring is damaged somewhere. Check the wiring and the connector at the EGR valve if no damage is found then replace the EGR valve and clean the port holes in the engine and the EGR tube that's running to the valve "IF IT HAS ONE". Clear the codes and drive it and see what happens. Hope this helps and have an awesome day Abe.

May 17, 2013 | Mercury Villager Cars & Trucks

1 Answer

Auxilary emissions controls

OBD2 fault codes have no cut and dry fix for every car that has it in memory. Here is the general info on the code. This code refers to the EGR valve back pressure sensor called the "DPFE" sensor
P1401 - DPFE Circuit High Input
Symptoms - Engine Light ON (or Service Engine Soon Warning Light) Possible causes
  • DPF EGR circuit open.
  • VREF short to PWR.
  • Damaged DPF EGR sensor.
  • DPFEGR circuit short to PWR.
  • SIG RTN circuit open.
  • Damaged PCM.
  • Possible solution A DPF EGR PID reading greater than 4.5 volts with the key ON and engine OFF or running indicates a hard fault.

    Jan 21, 2012 | Cars & Trucks

    1 Answer

    My 2003 Hyundai Accent just turned 90,000 miles. I recently got the required tune up & a belt changed (by a family friend). So a few days later my check engine light came on. I went to Jiffy lube for...


    Go to and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, campaigns, illustrations and procedures, etc.ghost45_58.jpg

    Sep 09, 2011 | Hyundai Accent Cars & Trucks

    1 Answer

    Orange engine light on and off at random. have 2 codes saying P1401 & P1237. Any idea what the codes mean?

    No, but check engine light mean emissions control system
    fault. Have Honda deal with it because the have the proper
    diagnostic equipment and parts to correct the problem. I
    wouldn't use after market parts.

    Feb 13, 2011 | 2002 Honda Civic

    1 Answer

    What is check engine light codes P 1401 and P1131?

    This is for the P1401
    HE - Exhaust Gas Recirculation (EGR) Systems
    ' var HIGHmap155714728 = '' // --> 155714728

    This is for teh P1131
    H - Fuel Control
    ' var HIGHmap155714613 = '' // --> 155714613

    Jul 18, 2010 | 1997 Lincoln Town Car

    2 Answers

    My Check engine light comes on even after the replaced part for code p1401 on a 2001 Ford Ranger. Any help would be appreciated. Thanks Ed

    Ford:DTC P1401 Differential Pressure Feedback EGR Circuit High Input
    did you do the pin point testes? a fault code only tell s the sensor signal has a problem, that can be the actual sensor or the connector, or the wiring or the powertrain control module, with this sesor you can also hook the hoses up wrong and excessive exhaust back pressure can cause this as well.

    Nov 03, 2009 | 2001 Ford Ranger Regular Cab

    1 Answer

    2000 Hyundai Accent

    00-30-001 2000 ACCENT DMTL DIAGNOSIS: DTC CODES P1401, P1402 AND P1403

    p1402 - dm-tl air pump motor is shorted or disconnected.

    2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.

    service information
    vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
    p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
    p1402 - dm-tl air pump motor is shorted or disconnected.
    p1403 - dm-tl changeover valve is shorted or disconnected

    Jun 04, 2008 | 2000 Hyundai Accent

    Not finding what you are looking for?
    1998 Ford Ranger SuperCab Logo

    3,367 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Ford Experts


    Level 3 Expert

    76846 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22246 Answers


    Level 3 Expert

    5546 Answers

    Are you a Ford Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides