Question about 2002 Mercury Mountaineer

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I have po401 code that show up what shall I look for to fix this problem

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There are two tubes from the Exhaust to a sensor called the DPFE, make sure they do not leak.

Unplug the wires to it, make sure the terminals are not corroded, clean them anyway, try it again.

Replace the DPFE sensor if no good, also replace both tubes (hoses) as they will most likely break when you take them off.

On vehicles that are no well maintained you also wany to remove the EGR valve and make sure the ports are not clogged.

Posted on Oct 23, 2013

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How can fix the problem po401 obd code


You have to find and fix the fault the code relates to , delete the code then test drive to make sure the code does not come back if it does the fault is not fixed.

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How do I Fix a PO401 code for a 1997 Ford Explorera with a 5.0 engine


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Ok i have 3 code po401 andp1456 and p1491 and a smell like exhaust fume


Us Google & put in your vehicle
followed by OBD Codes PO401 etc

All the codes,solutions & all you will ever
need to know including a fix is on google
or you tube video

This is just a social forum to point you
in the right direction, or we have to look
up the answers for you

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How to fix code po401 and po 340


here's a link to some information on the codes you asked about
P0401
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good luck!

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I have a 1997 ford Taurus 3.0 v 6 the check engine light is on My scanner shows a po401 low flow egr what is the most commed fix.


EGR Valve

You can print all codes from
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Remember every vehicle has MFG
Specific Codes that aren't easy to find
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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.

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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.

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2004 Mercury Monterey 70k CEL code PO401


po401 egr flow insufficient vaulve could be stuck or disconected

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Trouble codes PO174,PO401,PO420 NEED TO FIX SO I


P0174 means Fuel Trim too Lean (Bank 2)

P0401 means Exhaust Gas Recirculation Flow Insufficient Detected

P0420 means Catalyst System Efficiency Below Threshold (Bank 1)

Visit http://www.troublecodes.net/OBD2/

and Visit www.repairpal.com

Sep 28, 2009 | 1999 Ford Contour

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