Question about 2004 Mazda 6

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I have a 2004 lincon ls v6 and I got the code p0401 I replaced the egr valve completely and the code still came back on, what do I do? Please help.... clueless.

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P0401 is a low egr flow code. It is rarely the EGR valve and more often than not the DPFE sensor that has failed. To find the DPFE sensor follow the metal tube from the EGR valve to the exhaust pipe. There will be two rubber hoses attached to that tube. The DPFE sensor will be on the other end of those hoses.

Make sure there are no holes in the rubber hoses. This can cause false codes as well.

Posted on Nov 07, 2010

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Trouble code P0401


code p0401 refers to exhaust gas recirculation(EGR) system-insufficient flow detected--- Causes ---hose leak/blockage, basic setting not carried out( if applicable)wiring--EGR valve/solenoid---ECM I would check the EGR valve solenoid first. Replace the faulty units with genuine one because most aftermarket units are not set for OEM cpu units and are not completely
compatible.

May 11, 2013 | 1997 GMC Sonoma

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Is there a "computer flash update" for my 2001 isuzu rodeo ls 3.2l (v-6)


code p1120 refers tothrottle position sensor1--circuit malfunction---causes ---wiring open cuircuit--/short circuit to ground/short circuit to positive---throttlecontrol unit---ECM
code p0401 refers to exhaust gas recirculation(EGR) valve system---insufficient flow detected. ---causes hose leak/blockage--basic setting not carried out (if applicable)---wiring---EGR valve---EGR solenoid----ECM. I would replace the EGR valve for starters Get unit from the wreckers. You may have to have the CPu reset with a code reader tool

Mar 31, 2013 | 2001 Isuzu Rodeo

2 Answers

Egr fault code p0401


Hi there:

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 helps.

Dec 06, 2012 | 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

-----------

DTC Trouble Code P0401?

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

-----------
These will help.
Thanks.

Nov 28, 2012 | Honda Accord Cars & Trucks

1 Answer

Hw do u know wat to do wen the code p0401 pop up


Hi there,

Well done on obtainging this code.

Code P0401 = Insufficient EGR circuit Flow

The EGR circuit consists of i) EGR Valve; ii) actuator solenoid; iii) differential pressure sensor. These components work together to deliver the correct amount of recirculation, depending on engine temperature, load, etc. So, when code P0401 is triggered, this means the computer has detected an insufficient amount of EGR somewhere within this circuit.

So, with this said, the possible causes are:
  • Differential Pressure (DPFE) Sensor is faulty
  • A blockage in the EGR Tube, possible caused by Carbon buildup
  • Faulty EGR Valve
  • Lack of vaccuum to the EGR valve (i.e. valve cannot open)
Note: replacing the EGR valve should only be done, after checking the other components are ok and confirming there is proper vaccuum present.


Hope this helps.....





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Sep 04, 2011 | 1998 Ford Taurus

2 Answers

1999 mercury sable engine code p1744,p0401. Failed e check. EGR looks new, replaced egr solenoid then cleared codes. what more can i do about the p0401 code and the p1744 code Thanks


for p0401:
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.

Jul 08, 2011 | 1999 Mercury Sable

1 Answer

How much to fix the P0401 egr problem in a 2001 mitsubishi mirage LS with over 100k miles on it?


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


Keep us updated.

Apr 14, 2011 | 2001 Mitsubishi Mirage

1 Answer

P0401 check engine light code. What will fix it?


need to replace exhauust gas recirculation (EGR) valve....code p0401 reads EGR insufficient flow detected .............(so it is probably not opening properly.hope this helps you....thanks for using fixya.

Mar 13, 2011 | 2004 Hyundai Santa Fe

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

2 Answers

Codes P0401 and P0441 on a 1996 98 Olds


P0401--- the egr valve has insufficient air flow. Needs to be taken off and cleaned, if not replaced. The port holes might be clogged up, or the valve itself might be bad.
P0441---- The evaporative emission control purge valve has low air flow, probably do to the egr valve.
If you take off the egr valve, you will need to replace the gasket, or it won't seal right when it's put back on.

May 05, 2010 | 1996 Oldsmobile Ninety Eight

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