Question about 2001 Chevrolet Impala

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I did try unhooking the egr valve tube to see if relieving pressure that way would make a difference , but it still had lack of powerupon acceleration in my 2001 chevy impala

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That hole is not big enough to relieve the back pressure if your catalytic convertor is restricted.the best way to tell is by using a backpressure gauge installed where the front oxygen sensor is located.pressure should be under 1-2 psi under heavy acceleration.The front oxygen sensor is in the exhaust manifold on the back side of the engine.

Posted on Apr 14, 2014

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Skipping upon accelaration 1399,1456 and 401 codes showed up


oh yes i know its you EGR valve (Exhaust Gas Recalculation)

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 Related EGR Articles: P0400 - P0402 - P0403 - EGR System Explained

Read more at: http://www.obd-codes.com/p0401
Copyright OBD-Codes.com

Oct 02, 2013 | Cars & Trucks

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

1 Answer

What is code 0401 insufficient flow to EGR valve


A code P0401 likely means one ormore 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 vacuum
PossibleSolutionsTo fix this code, it is quite commonfor people to just replace the EGR valve only to have the OBD code return. TheEGR 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 noticeable 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

Mar 07, 2012 | 1994 Ford Taurus

1 Answer

Erg flow insufficient


  • 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
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
The EGR valve is located in the engine compartment. Its should look this

2_7_2012_10_25_48_pm.jpg

Feb 07, 2012 | 2000 Mercury Sable

1 Answer

How much to fix the P0401 egr problem in a 2001 mitsubishi mirage LS with over 100k miles on it?


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


Keep us updated.

Apr 14, 2011 | 2001 Mitsubishi Mirage

1 Answer

1997 volvo 960, check engine light on with P0401. These motronic 4.4 do not have EGR, p0401 mean insufficient EGR flow. How do you fix this if there is no EGR?


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

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

Check it and send us your advance.

Mar 02, 2011 | 1997 Volvo 960

1 Answer

A P0401 code sets. I have done the egr valve three times on this car. I have cleaned the intake and the exhaust tube five times. The last time was only 1000 miles ago. The egr valves are new from the...



  • Restriction in the EGR passages, usually caused by carbon buildup
  • The EGR Valve is defective
  • Lack of proper vacuum or electrical signal to the EGR valve
  • Malfunctioning EGR Vacuum supply solenoid
  • Lack of proper EGR system feedback to the computer from the:
    • Manifold Absolute Pressure Sensor (MAP)
    • Differential EGR Pressure Feedback Sensor (DPFE)
    • EGR Valve Position Sensor (EVP)
    • EGR Temperature Sensor


    Feb 28, 2011 | 2006 Suzuki Grand Vitara

    1 Answer

    2002 Mercury cugar P0401 and P1401


    DTC P0401 - Insufficient EGR Flow

    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.

    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


    DTC P1401 - Differential Pressure Feedback Electronic Sensor circuit High Voltage

    I think that you need a new DPFE; first check it, you could also have something restricted. There are ports in the throttle body that can cause this as well. Check THIS LINK.

    Hope helps.

    Nov 04, 2010 | Mercury Cougar Cars & Trucks

    1 Answer

    How to fix code 401 on 2001 eclipse


    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 vacuum

    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 noticeable 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

    Mar 31, 2010 | 2001 Mitsubishi Eclipse

    1 Answer

    Lack of power, exhaust smoke and engine miss firing, EGR Valve has been removed and cleaned, new EGR Valve was fitted, made no difference, old EGR Valve refitted, car runs with no exhaust smoke and no miss...


    Just an idea but the Ford Mondeo ( european car ) from which I believe your engine
    is taken has a habit of splitting a low pressure tube at the back
    of the engine this is a relatively
    cheap, easy fix. The other symptom this used to throw up was a
    little more black smoke from the exhaust and a pacing/ surging from
    the engine.

    Mar 24, 2010 | 2004 Jaguar X-Type

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