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Anonymous
Anonymous Posted on May 31, 2008
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Ford explorer 2002 v-8 code po401 low flow on obd-2

The engine light comes on., the code is PO401., i changed the egr pressure differential sensor., didn't helped. what's next....any ideas...

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  • Anonymous Jun 01, 2008

    found a good site that explains few possibilities.

    whohttp://free-auto-repair-advice.blogspot.com/2007/08/understanding-ford-dpfe-and-egr-system.html

  • Anonymous Mar 15, 2014

    how to fix a po401 code on my 99 ford windstar

  • Anonymous Mar 26, 2014

    engine light wont go out. changed egr valve, the cylinoid ,light still wont go out code po401 keeps coming back how to fix this problem it wont pass inspection

  • Anonymous Mar 28, 2014

    check engine light

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  • Posted on Aug 06, 2008
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Replacement engine put in with 51000 miles and now the engine light is on and the speedometer goes from 50 to 0 and then jerks

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Anonymous

Service engine soon light comes on. Problem?

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Related Questions:

0helpful
1answer

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.
Read full answer
Jun 29, 2013 • Dodge Ram 1500 Cars & Trucks
1helpful
1answer

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
Read full answer
Nov 04, 2012 • 2003 Hyundai Santa Fe
0helpful
1answer

I have the code PO401 AND PO402 codes on my 2002 focus, any suggestions?
PO401: EGR insufficient flow detected
PO402: EGR excessive flow detected

A code P0402 most likely means one or more of the following has happened:

The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum
Read full answer
Feb 25, 2012 • 2002 Ford Focus
0helpful
1answer

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
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Sep 21, 2011 • 2002 Ford Explorer
0helpful
1answer

OBD II code PO401 EGR Problem? Change Solenoid and pressure sensor; egr valve working good. Pressure sensor have 5 volt reference and ground; solenoide have 12 volt in red cable and negative is ok. Ford...
The EGR solenoid hardley ever goes out..Probably a flow problem,,If its the 4.2 its more than likely the EGR ports...Please list the engine..I may know what to tell you to fix it..
Read full answer
Sep 14, 2011 • Ford E-250 Cars & Trucks
0helpful
1answer

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.
Read full answer
Oct 16, 2010 • 1997 Chevrolet Lumina
0helpful
1answer

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.
Read full answer
Jun 14, 2010 • 2006 Ford Mustang
1helpful
1answer

I have a ford explorer sport 2002 and my chek engine light came on it put out a code PO401 do you know what i need to buy
PO401 code means that:
The PCM has determined that there is insufficient flow in the exhaust gas recirculation system. Definition: EGR system fault (Exhaust Gas Recirculation) Probable Causes: a. Blocked passage on EGR system b. Failed EGR Valve c. EGR solenoid faulty d. Failed EGR pressure sensor where applicable e. Failed EGR position sensor where applicable
Read full answer
Mar 08, 2010 • 2002 Ford Explorer
0helpful
1answer

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.
Read full answer
Sep 20, 2009 • 1998 Ford Windstar
0helpful
1answer

Engine light on
Try A DPFE sensor ( Differential FeedBAck ) sensor that controls the EGR .. Lemmie know
Read full answer
Mar 17, 2009 • 1996 Toyota Paseo
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