Question about 1992 Ford Ranger

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P0401 code egr problem - 1992 Ford Ranger

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  • cyborspy Nov 10, 2008

    I have the same problem and I have replaced the EGR valve and cleared the pathway and checked it by blowing compressed air thru the pathway. I also squirted brake cleaning fluid thru the passageway with the engine running and It choked off the engine so the pathway is clear but I still get the check engine light with the same code. "EGR insufficent flow" Help !!!



    Mike

  • Anonymous May 08, 2009

    my check engine light won't go off, i have replaced the egr valve,all four oxygen sensors, but the truck is running fine except for the light, the last thing i will replace will be the pressure valve, if the converter was bad how would i know ? this is on a 2001 ford expedition

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Either the vacuum supply to the DPFE (Delta Pressure Feedback EGR) sensor has been compromised due to a disconnected or broken vacuum line, the electrical connection to the DPFE sensor has come off, or the DPFE sensor itself has gone bad. The sensors are such a high fail item that they are now available at aftermarket venues like NAPA and Auto-Zone.

Check your connection, if it's tight, check the vacuum hoses. There will be two or three depending on the style of your sensor. Regardless of the count, there will only be about a foot of hose to check. If the hose is bad, it will obviously need to be replaced, but it can't be standard vacuum/washer solvent hose due to the application. Your friendly Ford dealer has the hose in bulk. It a silicone compound type hose to better resist the heat. I

f the hose is OK, then the DPFE needs to be replaced. Prepare to shell out around $80 to $100 depending on your particular application. If the new one looks different than the old one, it's OK as long as it has the same number of vacuum ports and the electrical connector is the same.

Posted on Feb 26, 2009

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HI.. On your Contour.
The code P0401 is refer to a Insufficient EGR flow Detected.
Or EGR system performance.

The most possible solution for this code is The replacement
Of the : EGRVR. Selenoid.
DPFEGR. SEnsor.
But go to the DEALER to buy them.
Because the aftermarket is like UNIVERSAL.., and you gonna have the same problem.


OK... I hope this help on your question.

Thank you for use fixya..

Posted on Aug 06, 2008

4 Suggested Answers

dustyboner
  • 331 Answers

SOURCE: I'm getting an engine check light, the OBD-II is P0401.

I would check the front o2 sensors because usually the EGR flow is detected by:

The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.

Posted on Oct 13, 2008

emissionwiz
  • 70347 Answers

SOURCE: P0401. P0133, P1131- emmision test

Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.

Posted on Oct 16, 2008

bibleman01
  • 334 Answers

SOURCE: trouble code P0401

It sounds like the iat sensor "intake air temperature" sensor. When its cold it enriches the mixture.
God Bless Greg

Posted on Dec 05, 2008

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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code P0401 is an EGR code.
which is insufficient EGR (exhaust gas recirculation) flow.it is quite common for people to just replace the EGR valve.



You can try doing it your self.:----
To troubleshoot these issue and solve it yourself.I suggest you to go through few help links related to
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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).

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2 Answers

Fault code p0401


This error means Exhaust Gas Recirculation Flow Insufficient Detected.

You can deatils on the following site http://www.permoveo.ltd.uk/tabid/122/OBD-Error-Code/P0401/Diagnostics/Hyundai/Default.aspx

but for convenience I have reproduced that information here:
.
Generic OBD Error Code Details for P0401 Exhaust Gas Recirculation Flow Insufficient Detected What does this mean? OBD Code P0401refers to
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. SymptomsPossible sumptoms of OBD code P0401
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. CausesPossible causes of OBD code P0401
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 SolutionsIn 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 Related CodesP0400 P0402 P0403

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1 Answer

Check engine light stays on the code that keeps coming up is P0401 changed egr valve clened out carbon build up also smell gas when first start not driving and fuel millage not as good car runs good though...


Could be a EGR vacuum issue or temp sensor issue

Common Problems That Trigger the P0401 Code
  • Restriction in the EGR passages, usually caused by carbon buildup
  • Lack of a proper vacuum signal to the EGR Valve from EGR Vacuum Solenoid
  • EGR Vacuum Modulator is defective
  • EGR Temperature Sensor is defective
  • EGR Valve is defective
This is from:
http://repairpal.com/OBD-II-Code-P0401-Ford

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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.

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What does that mean?
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