Question about 2000 Chevrolet Malibu

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Check engine light on, a 2000 chevy impala, code p0401,cant get it inspected with the light on

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Chevy impala diagnostic code PO742

i have the same problem, what can i do to fix it?

Posted on Jan 18, 2009

  • 15935 Answers


The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases.

The EGR valve is vital to your car's emission controls.

When the EGR valve goes bad, it must be replaced - it cannot be repaired.

  • EGR Valve = Exhaust Gas Recirculation Valve.
  • The EGR valve controls formation of noxious emissions.
  • Rough idle and poor acceleration can be caused by a faulty EGR valve.

  • The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

    The only short term problem is a decrease in gas mileage - but it should really be replaced before sensors become sooted or your cat. convertor gets overworked prematurely.

    Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

    Posted on Apr 15, 2009

    • 145 Answers

    SOURCE: check engine light on

    You cannot reset the check engine light any other way than using a scan tool. Some auto parts stores will scan the vehicle for free then at least you will know the area of the fault.

    Posted on May 07, 2009

    • 5 Answers

    SOURCE: How do I reset the check engine light?

    disconnect the battery for 10min and the try it

    Posted on Jun 03, 2009

    • 1 Answer

    SOURCE: 2000 chevy silverado z71 check engine light will not go off.

    you have to know what the code is that your truck putting out your truck has 4 O2 sensors. the trucks computer is smart and the code will tell you witch one is bad but if you replace just one the next one on the same exhaust pipe will probley go bad so its safe to replace all four. the draw back to replaceing all of them is thay cost about 80 bucks for one ACDelco O2 sensor. It has to be done before it will pass Emissions. not a hard part to change about a 7/8 open end wrench will take it off. have fun.

    Posted on Jul 19, 2009

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    2 Answers

    What is the meaning of codes P0401 and P0301

    the P0401 code has to do with your exhaust! Could be caused from sensor to clogged exhaust! The P0301, I believe is misfire, cylinder #1

    Mar 02, 2016 | 2003 Chevrolet Impala

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    How do I correct a P0401 code on my 2.2 chevy corsica

    The passages are plugged ! pull EGR valve an inspect passages and the pipe for a restriction or damage and repair as necessary.

    May 30, 2015 | Chevrolet Corsica Cars & Trucks

    1 Answer

    What do OBDII Codes P0401 and P0404 indicate in a 2001 Chevy Impala?

    P0401 usually means for most vehicles
    Exhaust Gas Recirculation Flow Insufficient Detected

    P0404 usually means for most vehicles
    Exhaust Gas Recirculation Circuit Range/Performance

    Feb 18, 2015 | Cars & Trucks

    1 Answer

    What do the OBDII trouble codes P0401 & P0404 mean with 2001 Chevy Impala?

    P0401 Exhaust Gas Recirculation Flow Insufficient Detected

    P0404 Exhaust Gas Recirculation Circuit Range/Performance

    Feb 18, 2015 | Cars & Trucks

    1 Answer

    What are codes p0401 and p0300 mean on a 2000 isuzu trooper

    P0401 is EGR problem
    P0300 is a cylinder 3 misfire.
    Replace EGR valve and do a full tune-up.

    Mar 19, 2014 | 2000 Isuzu Trooper

    1 Answer

    2000 Chevy.Check engine light always on.Very little reserve power

    add a can of sea foam found at auto parts stores and clean the air cleaner sensors inside with carb. cleaner spray. Change the air filter if needed

    Mar 25, 2010 | 2000 Chevrolet Impala

    1 Answer

    Chevy Impala 2001 w/ 3.8L engine - EGR stuck open

    there are a couple of things, first make sure there are not restriction in the exhaust, i know the dealer has had to replace converters under warranty because of this problem, then theres a reflesh program for the computer due to this problem, and lastly,run with egr off make sure it clean of carbon,carbon gets stuck in pintle sets check eng lightbut carbon then blows by so when you remove egr you see nothing, well start with these good luck.

    Nov 28, 2009 | 2000 Chevrolet Impala

    1 Answer

    2000 Ford Windstar 3.8L error P0401 then P0404

    if the check engine light is blinking,you have a misfire(spark plugs,plug wires or coil pack.inspect the plug wires for damage.The rear bank plug wires (at the fire wall) get alot of heat and the boots will crack, causing a misfire.You might want to have your local shop check it for you,to see if there is an open circuit or shorting in one or more of the plug wires.if it has been awhile since a tune-up,you might want to do that first,and inspect the plug wire boots also and replace them if needed.

    Oct 24, 2009 | 2000 Ford Windstar

    1 Answer

    Multiple random miss fire

    Now change the distributor. Get one from salvage or e-bay. Did the timing belt jumped a tooth or is it new. Vitally

    May 12, 2009 | 2000 Chevrolet Impala

    1 Answer

    2000 chevy impala will not start with remote start

    There are several things that can cause this.
    A common cause for this is that the check engine light is, or has been been on. When the check engine light comes on, a trouble code is stored in the computer. Most trouble codes will cause the remote start to become inoperative. Repair of the check engine light code is needed first. A scan of the system will show any stored codes.
    Another cause is a faulty hood ajay switch.
    Tech JK


    Jul 23, 2008 | 2002 Chevrolet Impala

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