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Po401 ive cleaned the egr & replaced the egr but i keep getting this code??

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  • Chevrolet Master
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Depending on your model, there may be a solenoid valve that turns the vacuum to the egr valve on. If the solenoid fails, the egr valve will not open. Follow the vacuum line on the egr valve--does it go to a solenoid valve? If yes, apply 12 volts directly to the solenoid blades to see if it clicks open. If it doesn't click, replace the solenoid.

Posted on Apr 09, 2011

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1 Answer

Kept getting a code po401


Did you check to make sure the ports going and coming from the egr are open, not clogged with oil and carbon deposits ? Common failure is a clogged port.

Jan 14, 2015 | 2003 Hyundai Santa Fe

1 Answer

Code po401


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'sicon1.png & 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

Nov 04, 2012 | 2003 Hyundai Santa Fe

1 Answer

P0401 EGR code In Ford explorer 2002


PO401--- EGR Flow Insufficient Detected

If all you have is an egr valve replace it

If you have other hoses & sensors coming & going from it,
leave it to a repair shop

Sep 21, 2011 | 2002 Ford Explorer

1 Answer

Egr engine code po401 is on in my 1996 ford explorer ive changed my egr valve blow out the egr tube i replaced my egr selenoid as well can it be a bad catalystic converter im going to test dpfe sensor what...


Disconnect vacuum supply hose to EGR V.R. solenoid at the solenoid. Connect the vacuum supply hose to a vacuum gauge. Start engine and check the vacuum at idle. Is the supply vacuum greater than 10 in-Hg (34 kPa) ?

Jun 10, 2011 | Ford Explorer Cars & Trucks

1 Answer

I have a 1997 chevy lumina. i had 2 coded before, po420 and po401. i changed the egr valve, and now the po420 is gone. i just replaced the egr tube, cleared the codes, and now the po401 is back. car sounds...


Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.

Oct 16, 2010 | 1997 Chevrolet Lumina

1 Answer

Engine light on code reads po401


I believe this code is insufficient EGR flow. On this engine, the passages to the EGR valve often become carboned up and cause this code. Remove the EGR valve and inspect the passages to see if they need to be cleaned.

Jun 14, 2010 | 2006 Ford Mustang

1 Answer

I have a 99 Windstar 3.8L Keep getting DTC PO401 have replaced DPFE EGR Valve and EGR tube still keep getting Code PO401


Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

May 30, 2010 | 1999 Ford Windstar

1 Answer

Code po401 for check engine light


PO401 Insufficient EGR Flow, valve could be stuck or disconected.

It could very possibly the EGR tubes are clogged or the EGR is not opening or could be DPFE; first i would check the tubes on the DPFE and also clean the EGR tubes and egr it self simple brake clean and a hanger can clean the tubes and spray some in the EGR it also can get gunked up and not move properly.

Hope this help to solve it (remember comment and rated this).

Apr 05, 2010 | 1999 Mercury Sable

1 Answer

1998 Ford Windstar, no start with out pushing on throttle, some times not then, runs ok after it starts. have codes, PO340 & PO401


po401 is egr flow insufficiant ( the egr needs removed and cleaned also clean where it mounts to engine. po340 is camshaft position sensor A- bank 1 curcuit malfunction. it is a bad camshaft sensor.

Sep 20, 2009 | 1998 Ford Windstar

1 Answer

1996 toyota camery code po401


Clean the EGR air passage tube.

Carbon built up is worst inside this air passage tube.

You will need Seafoam or WD-40 and LOT OF TIME to clean out this tube.

A vacuum will help speed up the cleaning.


Please post more information on the comment window.


Aug 11, 2009 | 1996 Toyota Camry

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