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P401 egr valve problem honda civic 2003 ex how do i fix it i already replaced egr valve and cleaned passages

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

STEVIE_N_24
  • 147 Answers

SOURCE: 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.

Posted on Mar 29, 2009

  • 850 Answers

SOURCE: p0405 code.. changed egr valve and cleaned passage

egr may be fowled again [carbon]

Posted on Jul 20, 2009

kel1guy2002
  • 3740 Answers

SOURCE: How to clean EGR valve passages in 1993 Isuzu Trooper DOHC V6

You have to the EGR valve (sometimes the Intake manifold to EGR Vlalve line also). After you remove it take a drill bit the about 20 % smaller than the actual hole of the outlet side and rotate the drill bit with your hand to dig out the carbon. Aditionally the line coming from the intake manifold to the EGR valve will clog near the connection to the EGR valve. I use either a single piece of copper wire or the wire that you would use to tie ribar together to clean the line. When your done cleaning take a piece of vacuum line and connect it to the diaphram side and **** on it... then plug the line well with your thumb. Grasp the valve and blow thru it... Air should blow thru it freely. Remove your thumb from the vacuum line and try blowing again.. No air should pass thru the valve.
Then reinstall the valve and start the vehicle with the vacuum line disconnected (but blocked off) Use another piece of vacuum line connected to the diaphram again and **** on the line.. The vehicle should die or run really bad. If it does this then you cleaned it correctly.

Posted on Jan 20, 2010

ZJLimited
  • 17970 Answers

SOURCE: p401 code?

P0401 OBD-II Trouble Code - Insufficient EGR Flow

What does that mean?
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.


Symptoms
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.


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


Hope this helped (remember comment and rated this).

Posted on May 05, 2010

  • 40820 Answers

SOURCE: My 2003 Honda civic ex failed smog for p401 code egr valve needs to be cleaned can I diy?

you can but I recommend that you fit a new unit

Posted on Jan 16, 2016

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1 Answer

03 honda civic 1.7L p0401 EGR code.


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)

Read more at: https://www.obd-codes.com/p0401
Copyright OBD-Codes.com

Sep 19, 2016 | 2003 Honda Civic

1 Answer

P0401


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.

Mar 18, 2014 | 2003 Honda Civic

1 Answer

97 ford escort p401 code


You may have carbon plugging the passages on the intake side of the valve. Remove the valve and start the engine. It should die or run very rough. if it idles normal then you have blockage that needs to be cleaned out.

Dec 05, 2013 | Ford Cars & Trucks

1 Answer

Where is the EGR vavle on a 1997 honda civic ex located?


The EGR Valve is located right on the back of the intake manifold on the left side. Take the cover off the top off the intake manifold and you will see groves under it inside these groves are a couple of hole about 5/16 diameter. clean the holes and groves , and your back in business. Note somtimes this area gets so gummed up you may not see the groves , make sure you clean out the grooves and the holes . ----------- This should help.Thanks.Helpmech.

Oct 07, 2011 | 1997 Honda Civic del Sol

1 Answer

P401 code?


P0401 OBD-II Trouble Code - Insufficient EGR Flow

What does that mean?
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.


Symptoms
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.


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


Hope this helped (remember comment and rated this).

May 05, 2010 | 2002 Honda Passport

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

Emission Problems/Window Problems


check to see if the egr passages are clogged by removing the egr and starting the engine one port should have vacuum and the other should have exhaust pressure i see alot of passages clogged

Sep 24, 2008 | 1996 Honda Civic

2 Answers

CAR PROBLEMS..NEED HELP


your egr valve is sticking

Aug 24, 2008 | 2003 Honda Civic

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