Question about 2001 Mercury Sable

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2001 mercury engine code P0401 - 2001 Mercury Sable

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  • Mercury Master
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DTC P0401 - Insufficient EGR Flow

What does that mean? EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms: You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes: 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

Hope helps (remember comment and rated this).

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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greg_margo
  • 1959 Answers

SOURCE: mercury sable 2001 duratec engine DOHC I get check engine light and diagnostic code PO401". Any suggestions?

Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.
Greg

Posted on May 30, 2009

  • 312 Answers

SOURCE: Where is the DPFE Sensor located on my 2001 Mercury Cougar

The dpfe is located at the back of the intake manifold on a metal bracket it has an electrical connector coming from it and 2 rubber hoses that go down to the exaust manifold

Posted on Dec 27, 2009

  • 203 Answers

SOURCE: I have a 2001 Ford Taurus the check engine light

insufficient egr flow usually the dpfe sensor located in the back of intake manifold or mounted
on firewall.if you follow the wires/vacuum line from the egr valve you'll see it. common problem
& fairly easy job pick up a new 1 so you no what it looks like

good luck

Posted on Jun 19, 2011

sicaudio
  • 96 Answers

SOURCE: MERCURY 2000 ODB2 CODES P0400, P00A0, P0401

P00A0 is a factory readable only code (i.e. only ford dealers have the computer to read it)
the P0400 is a generic E.G.R. flow restriction code. so yes a dvom (multimeter) and a vacuum pump to diagnose it correctly, also check for loose wires as ford harness connectors are known to fail alot due to crappy phenolic content in the plastic and heat combined they can warp and / or corrode the contacts

Posted on Sep 26, 2008

jturcotte
  • 8516 Answers

SOURCE: check engine code 2001 ford taurus p0401

usually caused by clogging or bad valve. Valve can fail by clogging, torn diaphram, or bad/loose vacuum actuation hose.

Exhaust gas recirculation (EGR) system - insufficient flow detected

Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM


Your EGR valve should be on top of the engine in the front between the intake manifold and the pulleys. It looks something like this:


382f71b.jpg
First, make sure the vacuum hose is good and run it down to where it connects to the intake manifold to check for any leaks. If that's good and you want to get your hands dirty, take the valve off and see if it's clogged. clean it and see if you can actuate it with vacuum (put a vacuum hose on it, ****, and see if it will open. Also, look to see if there is gunk in the line and intake where it connects. Clean out anything you can with carb cleaner.
If you can get it unclogged and the valve is working, put the valve back on with a new gasket, else buy a new one ($40 at autozone :o( ). If you solve the issue, the engine light should clear after a couple hours of driving. OK?

Posted on Oct 16, 2010

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PO 304 -cylinder misfire on #4--maybe-- could be any cyl,
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2001 mercury sable not wanting to take gas reading a code P0401


To the best of my knowledge, a P0401 is an EGR Sensor error code ( EGR=Exhaust Gas Recirculation) You may want to try cleaning it if you have the tools & ability to take it off. But there is a chance it may need to be replaced no matter what. I hope this helps =)

Aug 26, 2011 | Mercury Sable Cars & Trucks

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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

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This is the code number after testing for the check engine light P0401. Also , the exhaust gas recirculation flow is insufficient.


More than likely you have a faulty EGR Valve Pressure Sensor, especially if your EGR Valve Pressure Sensor is the original metal type. The new sensor is made of plastic and doesn't corrode like the old design. This sensor is located on the Intake Manifold.

pctech1_40.jpg

Here is the sensor: http://www.autozone.com/autozone/parts/2001-Mercury-Sable/EGR-Valve-Pressure-Sensor/_/N-jfkhrZ93y2i

It is also possible that the EGR Valve has a clogged port, but this is less likely.

Mar 15, 2011 | 2001 Mercury Sable

1 Answer

Where is the DPFE Sensor located on my 2001 Mercury Cougar? Keep getting P0401 code...changed AGV valve and solenoid...engine light keeps coming on after i drive


The dpfe is located at the back of the intake manifold on a metal bracket it has an electrical connector coming from it and 2 rubber hoses that go down to the exaust manifold

Dec 27, 2009 | Mercury Cougar Cars & Trucks

1 Answer

2001 Sable gets P0401 first, then gets P0442 some miles later. When P0442 sets, so does engine check light. Car runs well. What could cause this sequence of error codes?


This could be a small evaporative system leak. Check the gas cap to be installed fully. If fully installed may need replaced.

Oct 14, 2009 | 2001 Mercury Sable

2 Answers

Mercury sable 2001 duratec engine DOHC I get check engine light and diagnostic code PO401". Any suggestions?


Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.
Greg

May 30, 2009 | 2001 Mercury Sable

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