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P0401 code 0401

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EGR flow restricted. DO NOT replace the egr valve. The passages in the manifold are plugged up with carbon, clean them and it is fixed.

Posted on Nov 17, 2014

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Posted on Jan 02, 2017

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I have a Ford F-150 xlt 4.6 with a p0401 code.


code p 0401 refers to exhaust gas recirculation (EGR) system---insufficient flow detected==== causes ---hose leak/blockage, basic setting not carried our (if applicable)---wiring---EGR valve ---EGR solenoid ---ECM
when you have done everything make sure that you use a scan tool to reset the ECM
Items that you haven't mentioned are wiring and substituting the ecm with a known operational one
bad wiring and connections / ground , broken in side the insulation may cause the problem as well

Sep 25, 2016 | Ford F-150 Cars & Trucks

1 Answer

How to fix P0302 and P0401 error codes for Lincoln Town Car 2001?


code p 0302 i cylinder 2 --misfire detected ===causes --- engine mechanical fault ( valve seat insert loose , burnt valve , cam followers/ hydraulic followers faulty)---wiring---ignition/fuel system---injector--ECT/MAF sensor ---ECM
possible injector fault ( blocked tip)
code p 0401 refers to exhaust gas recirculation (EGR) system--insufficient floe detected ==== causes --hose leak/ blockage ---basic setting not carried out (if required)---wiring---EGR valve ---EGR solenoid ---ECM
as you admit to knowing little about cars , take it to an accredited service center that works on your make of vehicle and get a proper diagnosis and quote
Use the codes information and causes I have given you when discussing the problem

Jul 22, 2016 | 2001 Lincoln Town Car

1 Answer

1996 toyota corolla p0401


code p 0401 refers to 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
take it to an accredited service centre that has experience on your make of vehicle , tell them the fault details and get a proper diagnosis to determine the fault and a quote

Mar 27, 2017 | Toyota Corolla Cars & Trucks

2 Answers

'01 Honda Accord, EX-L, V6, Code P0401 comes up at Auto Zone Is this a DIY job? Fairly handy


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
OBD code P0401:-----
Click the link below:-----


1997 Chrysler Sebring: OBD Error Code P0401?

http://howtobyme.blogspot.in/2012/06/1997-chrysler-sebring-obd-error-code.html

----------

2004 Hummer H2: OBD Code P0141?

http://whoisbyme.blogspot.in/2012/06/2004-hummer-h2-obd-code-p0141.html

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DTC Trouble Code P0401?

http://schematicsdiagram.blogspot.com/2012/01/dtc-trouble-code-p0401.html

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These will help.
Thanks.

Nov 28, 2012 | Honda Accord Cars & Trucks

1 Answer

What is code 0401 insufficient flow to EGR valve


A code P0401 likely means one ormore 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 vacuum
PossibleSolutionsTo fix this code, it is quite commonfor people to just replace the EGR valve only to have the OBD code return. TheEGR 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 noticeable 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

Mar 07, 2012 | 1994 Ford Taurus

1 Answer

1996 Trooper (P0401 Code- GONE!!!-) BUT,,,,now I have Code- P1133 and P1153. Both are O2 sensor codes. Here is the weird thing! I tried everything in the book to try and fix the P-0401- Insufficient...


I had a similar problem with code PO401
The solution was to loosen up the throttle cable a bit.
Since the TPS value has to be at 0.0% at idle.

May 03, 2011 | 1996 Isuzu Trooper

2 Answers

Check light on,problem shows on p 0401


P0401-Insufficient flow in the exhaust gas recirculation system (EGR-valve). Check your gas cap for cracked seal, check EGR valve (make sure all vacuum hoses aren't leaking), check also VSV (vacuum switching valve) for proper operation. Its best to get an owner's manual or an experienced mechanic to diagnose!!hopefully this helpd

Oct 06, 2010 | 1998 Toyota Camry

1 Answer

Radiator fans fuses keep blowing-chevy impala 2002. we need info on following codes: P0108, P0128, P 0341, P 0401, P 0420, P 1480, and P 1481. John


p0108 map curcuit high input, p0128 coolant temperature below thermstat regulating tempurature, p0341 is camshaft position sensor A-bank 1 ckt range/performance, p0401 is exhaust gas recirculation, insufficiant flow detected, p0420 is catalyst system efficiency below threshold, p1480 is manufacturer control auxilary emission controls, p1481 is same as p1480.

Jun 15, 2010 | 2002 Chevrolet Impala

1 Answer

1998 acura 2.5 tl


P0401 means
EGR port is clogged or has failed.

Oct 15, 2008 | 2003 Acura 3.2CL

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