Question about 2003 Mitsubishi Eclipse Coupe

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What is causing code P0401, have replaced the EGR valve and cleaned out hoses

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greg_margo

Greg Margossian

  • 1959 Answers

SOURCE: EGR Valve needs cleaning or replacing

The link below is a diagram of the EGR valve. Looks like a mushroom with vacuum lines attached.

http://www.chiltonlibrary.com/content/images/8666/images/86664018.gif

Instructions:

  • Label and disconnect the hoses from the valve. Carefully loosen and remove the retaining bolts, remembering that they are probably heat-seized and rusty. Use penetrating oil freely.
  • Remove the valve and clean the gasket remains from both mating surfaces.
  • Inspect the valve for any sign of carbon deposits or other cause of binding or sticking. The valve must close and seal properly; the pintle area may be cleaned with solvent to remove soot and carbon.

  • I hope this answers your question. Best of luck.
    Greg

    Posted on May 30, 2009

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    Pablo Gonzalez

    • 733 Answers

    SOURCE: EGR CODE P0401,IF I APLLY VACUUM TO THE EGR VAVLE

    The mechanical components of the egr themselves may be fine, but the electrical circuit that moves the egr may be faulty. now if the egr valve uses vaccum to operate, then it may be sticking just enough to throw a code.

    Posted on Feb 11, 2010

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    ZJLimited

    ZJ Limited

    • 17970 Answers

    SOURCE: how to clean/check the egr valve

    When the EGR VALVE is clogged or malfunctioning, it can cause irregularities in engine performance such as rough idling or valve knock, indicating that the EGR valve should be inspected.
    The EGR valve works by routing a small amount of exhaust back into the combustion chamber. When the temperature in the combustion chamber is too high, nitrogen oxides are produced, which combine with elements in the atmosphere to form smog. Introducing a small amount of exhaust into the system reduces the temperature in the combustion chamber, reducing the amount of nitrogen oxides produced.

    Many EGR valves are mechanical, and simply have a small valve which opens to allow exhaust into the combustion chamber and closes when it is not necessary, and to keep the air mixture optimal for combustion. Some mechanical versions will not open until there is sufficient back pressure, ensuring that the valve will not be open when the engine is idle or warming up and needs a higher concentration of oxigen for combustion. Electronic EGR valves are also available, and use electronics to regulate the valve.

    If the EGR valve is stuck open, it will essentially cause a vacuum leak, leading to inefficient combustion, rough idling, hesitation, and sometimes stalling in extreme cases. This is because the car cannot combust on carbon dioxide from the tailpipe — it needs atmospheric oxygen. If the combustion chamber is flooded with exhaust from an open EGR valve, it will not function properly. To check and see if the EGR valve is stuck open, have someone idle a parked vehicle with the brake on while you examine the plunger shaft to see if it is stuck open.
    If the EGR valve is stuck closed, emissions of nitrogen oxides will rise, and the car may start to knock. Spark knock happens when the fuel mixture in the combustion chamber ignites before it has been reached by the explosion in the cylinder, resulting in a disruption of the engine timing. In this instance, the engine should be warmed up and revved to see if the EGR valve will move.

    In both cases, simple repairs are possible. The EGR valve can be clogged, and a simple cleaning of a mechanical EGR valve may solve the problem. In the case of an electrically controlled EGR valve or a more complex mechanical problem, replacement of the valve may be needed. The EGR valve is an expensive motor vehicle component, and care should be taken to ensure that it needs to be replaced rather than repaired. A reputable mechanic should advise you appropriately.

    Failure to repair or replace the EGR valve will not lead to a life threatening condition, although it will reduce the life of your car and increase the potential emissions. Especially in areas which require smog testing, an automobile with a malfunctioning EGR valve may not pass

    HERE can find one video about this subject.

    Hope help with this (remember rated this help) Good luck.

    Posted on Mar 18, 2010

    archaeology

    Archaeology

    • 662 Answers

    SOURCE: How to clean a egr valve from a 2000 mitsubishi

    Your new EGR valve (assuming it wasn't defective out of the box), is fine, but the car's computer just needs to have its code 403 cleared. Even though you've corrected the problem, the computer will still light the "Check Engine" light, and store code 403 until the code is cleared using an OBD-II (On-Board Diagnostics 2) code scanner.
    Note that the car will function perfectly with its new EGR valve, a lit "Check Engine" light and a code 403 stored. Its just a good idea to clear the code, so that then only NEW problems will become the reason that the "Check Engine" light gets lit.

    Posted on Oct 05, 2011

    richard allen

    • 560 Answers

    SOURCE: need a picture of exaust recirculation system for 2002 mitsubishi lancer

    you have a pluged up egr port behind the throttle body trust me

    Posted on Jun 05, 2012

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    P0401 code


    causes include --hose leakage / blockage, basic setting not carried out ( if applicable)--wiring---EGR valve ---EGR solenoid ---ECM

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    P0401 exhaust gas recirculation flow insufficient detected


    causes for this code are--hose leak/blocked--basic setting not carried out (if applicable)--wiring--EGR valve--EGR solenoid---ECM
    try cleaning the egr valve and replacing the egr solenoid.

    Aug 31, 2013 | 1995 Ford Crown Victoria

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    Trouble code P0401


    code p0401 refers to exhaust gas recirculation(EGR) system-insufficient flow detected--- Causes ---hose leak/blockage, basic setting not carried out( if applicable)wiring--EGR valve/solenoid---ECM I would check the EGR valve solenoid first. Replace the faulty units with genuine one because most aftermarket units are not set for OEM cpu units and are not completely
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    May 11, 2013 | 1997 GMC Sonoma

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    I have a code P0401. What is this and how can I fix it?


    P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

    Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
    - EGR volume control valve stuck closed
    - EGR volume control solenoid valve
    - Dead (Weak) battery
    - EGR passage clogged
    - Exhaust gas leaks Possible solution - Clean EGR Valve
    - Repair EGR harness or connector
    - Replaced EGR volume control solenoid valve
    - Replaced EGR volume control valve

    Mar 20, 2011 | 1998 Ford Taurus

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    Ford Explorer : How to Troubleshoot the EGR P0401 Trouble Code


    P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

    Possible Causes:
    - Harness or connectors (EGR volume control valve circuit is open or shorted.)
    - EGR volume control valve stuck closed
    - EGR volume control solenoid valve
    - Dead (Weak) battery
    - EGR passage clogged
    - Exhaust gas leaks
    - Faulty EGR valve

    Possible Solutions:
    - Clean EGR Valve
    - Replace EGR Valve
    - Repair EGR harness or connector
    - Replace EGR volume control solenoid valve
    - Replace EGR volume control valve

    Jan 24, 2011 | Ford Explorer Cars & Trucks

    1 Answer

    I have a 2004 lincon ls v6 and I got the code p0401 I replaced the egr valve completely and the code still came back on, what do I do? Please help.... clueless.


    P0401 is a low egr flow code. It is rarely the EGR valve and more often than not the DPFE sensor that has failed. To find the DPFE sensor follow the metal tube from the EGR valve to the exhaust pipe. There will be two rubber hoses attached to that tube. The DPFE sensor will be on the other end of those hoses.

    Make sure there are no holes in the rubber hoses. This can cause false codes as well.

    I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

    Nov 07, 2010 | 2004 Mazda 6

    1 Answer

    I use seafoam though vaccume hose after that i read code p0401 what that means


    P0401: 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

    better clean out hoses and valves...

    Oct 04, 2010 | 2002 Honda Accord

    1 Answer

    OBDII SETS CODES P0401, P0171 & P0174 . 1998 Mercury Sable


    P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
    Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
    - EGR volume control valve stuck closed
    - EGR volume control solenoid valve
    - Dead (Weak) battery
    - EGR passage clogged
    - Exhaust gas leaks Possible solution - Clean EGR Valve
    - Repair EGR harness or connector
    - Replaced EGR volume control solenoid valve
    - Replaced EGR volume control valve
    Code P0171- Fuel Injection System Too Lean Bank 1 Possible causes - Intake air leaks
    - Front Heated oxygen sensor may be faulty
    - Injectors may be faulty
    - Exhaust gas leaks
    - Incorrect fuel pressure
    - Lack of fuel
    - Mass air flow sensor may be faulty
    - Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem P0174- Fuel Injection System Too Lean Bank 2 Possible causes - Intake air leaks
    - Front Heated oxygen sensor may be faulty
    - Injectors may be faulty
    - Exhaust gas leaks
    - Incorrect fuel pressure
    - Lack of fuel
    - Mass air flow sensor may be faulty
    - Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

    Jun 28, 2010 | 1998 Mercury Sable

    3 Answers

    Code on diagnostics p0401


    Code on diagnostics p0401:

    What is going on?
    Exhaust Gas recirculation low flow detected means that: there is vacuum problem in the EGR system - between the combustion chamber, EGR valve (mechanical - blown up diaphragm or clogged airlets/hoses) , EGR Modulator Valve (mechanical - blown up diaphragm, dirty EG/air filter or clogged airlets/hoses) and Vacuum Switching Valve ((mechanical - blown up diaphragm or clogged airlets/hoses OR electrical - VSV not properly synchronizing with the ECM, for instance).

    Effects?
    This causes the combustion chamber temperature to increase and produce Oxides of Nitrate (NOx) that is out of an acceptable emission range. This triggers the Malfunction Light (check engine light) to stay on (after a couple of driving cycles)!
    Solution: Focus on EGR airways (hoses...) and organs (EGR valve, EGR Modulator, VSV), clean, check or replace the defected one. VSV seems to be criticale as it plays electrical & mechanical function. Once the repair is done, Clear the P0401 code using an OBII scanner.

    Dec 21, 2008 | 1996 Lexus LX 450

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