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HYUNDAI XG300 2001CODE PO401 - Hyundai Cars & Trucks

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EGR valve could be dirty or bad.

Posted on Aug 16, 2017

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Posted on Jan 02, 2017

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2003 hyundai santa fe po401


P0401 means Insufficient Exhaust Gas Recirculation (EGR) Flow. The computer has detected that something is wrong with the EGR system. Can be caused by the EGR tube being blocked/restricted, bad EGR valve, EGR valve not opening (no vacuum), or a bad sensor.

Nov 23, 2016 | Hyundai Cars & Trucks

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

Egr PO401


Code 401 is for low EGR air flow. The EGR valve allows exhaust gas to be recirculated back thru the intake and reburned.
The problem could be the EGR valve, the sensor, or a blocked line.

Jun 29, 2013 | Dodge Ram 1500 Cars & Trucks

1 Answer

Trouble code po401


http://youtu.be/XgfT3kuY8lc here is a url to help you fix p0401 it is a video on you tube from scotty kilmer

May 23, 2013 | 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

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PO401 code car idles fine how do I fix? Yellow stripe hose clamped egr does not work if I put vacuum directly to egr it will work. Hoses look good. I think might be egr solenoid has office inside. 2004...


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

Aug 18, 2011 | 2001 Hyundai Santa Fe

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

2004 Mercury Monterey 70k CEL code PO401


po401 egr flow insufficient vaulve could be stuck or disconected

Mar 02, 2010 | 2004 Mercury Montery

2 Answers

97 toy corolla DTC po300 po301 po401 po402


po300 random/multiple cylinder misfire detected po301 cylinder 1misfire detected po401egr flow insufficient po 402egr flow excessive

Feb 11, 2010 | 1997 Toyota Corolla

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