Question about 2001 Ford Mustang

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Engine service light

I have a 2001 mustang with a engine light. They said the code read out that i need to replace the EGR valve. I replaced the egr valve but the code came back. Read the code again and it said the EGR valve was bad again.What would the next step be?

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  • edrosale Oct 06, 2008

    i got the same problem with my v6 mustang and the code reads P0401. I've replaced all egr parts, but not the hoses?

  • Loy Montgomery May 11, 2010

    What code did you get? P0401?

  • Juan Guillen May 11, 2010

    with the angine SIZE and with the Code number from the scanner I can help you.

  • Anonymous Mar 25, 2014

    back up in egr valve

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  • Master
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The DPFE (Diferential Pressure Sensor)sensor is usually mounted on the engine and is connected to the pipe that runs from the exhaust manifold to the EGR valve with two rubber hoses. When the sensor goes bad, the Check Engine light comes on and typically sets any or all of teh following fault codes: P0171 & P0174 (lean codes), and/or P0401 (insufficient EGR flow). Nine out of ten times, the fault is not a bad EGR valve or a vacuum leak, but a bad DPFE sensor. A replacement costs about $112 at Ford, or about $48 at an aftermarket auto parts store.I hope this helps.

Posted on Nov 08, 2008

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1 Answer

Service engine light pulls code to replace EGR valve, replaced part and car still runs the same and engine light is still on


the code would run if another error before it is faulty , labors indicates ignition fault , or timing problem , I once had cogs missing on distributer ,

Mar 22, 2012 | 2001 Ford Mustang

1 Answer

The service engine light is on in my Mustang and the computer is giving me the code for the EGR system. I've already replaced the EGR sensor and that didn't fix the problem. What else could I try?...


Exhaust gas recirculation - when your car is at running temperature it runs lean. A lean running engine has very hot ignition temperatures. This not only risks burning the valves but it also creates the ideal conditions for nitrogen to combine with oxygen; nitrous oxides are harmful emissions and are to be avoided. The EGR valve recirculates a metered amount of inert exhaust gas back into the inlet mix and artificially enriching the mix by effectively reducing the amount of oxygen. The engine ignition runs much cooler as a result, cool enough to avoid oxides of nitrogen from forming. The EGR valve sits between the inlet and exhaust manifolds. The EGR valve is most often opened electrically by the ECU when the engine is above idle at about 3000 rpm. The operation of the EGR is monitored by a DPFE sensor which measures pressure variation brought about by the opening of the EGR valve. The EGR valve is bolted on with two bolts and has an electrical connection to the top of it. Dismantle the EGR valve taking car not to damage the gasket as you can reuse it. Use plenty of WD40 or carburettor cleaner and clean the EGR pintle valve until like new and has full freedom of movement. Make sure the ports are clean before reassembly. That should be it unless the solenoid mechanism within the valve has burnt out in which case it will need replacing.

May 07, 2011 | 2000 Ford Mustang

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

2 Answers

Service engine code P0402 for Ford Mustang


P0402 OBD-II Trouble Code - Exhaust Gas Recirculation Flow (EGR) Excessive Detected

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 (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.

Symptoms
You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.

Causes
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

Possible Solutions
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
* Check the voltage at the DPFE sensor both at idle and when the EGR is open
* Replace the DPFE sensor

Hope helps (remember rated and comment this).

May 27, 2010 | 2001 Ford Mustang

2 Answers

EGR code keeps coming on


It may be, but the code will specify what the problem is as a lot of things can trigger an EGR code. There are numerous codes that relate to the EGR, but the individual code will usually pinpoint what the issue is.
Some causes could be the DPFE sensor is faulty; 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

Aug 25, 2009 | 2002 Mazda Tribute

1 Answer

I have a 2001 mustang with a 3.8l I have a trouble code P0104


It is the DPFE sensor with out this your rpms will continue surge. Alot of people make the mistake of just replacing the EGR valve instead of the DPFE sensor which measures exhaust prssure going through the EGR vavle.

May 07, 2009 | 2001 Ford Mustang

1 Answer

2001 ford mustang service engine light on


IT ALMOST SOUNDS LIKE YOU MAY HAVE A VACUUM LEAK SOMEWHERE. USE A LENGTH OF RUBBER HOSE AND HOLD IT UP TO YOUR EAR TO PIN-POINT THE LOCATION OF A VACUUM LEAK. HOPE THIS HELPS. LET ME KNOW PLEASE. THANK YOU IN ADVANCE FOR AN HONEST RATING AND THANKS FOR USING FIX-YA. P.S. EGR VALVE IS VACUUM ACTUATED

May 07, 2009 | 2001 Ford Mustang

1 Answer

Service engine code indicates EGR valve.


You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.

Mar 28, 2009 | 2001 Chevrolet Lumina

4 Answers

Replace egr valve


If the replaced the erg valve and the light came back on, you still have a problem, probably different then what they fixed.

Feb 01, 2009 | 2001 Buick Regal

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