Question about 2002 Volkswagen Jetta TDI

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How do you know when your egr valve goes bad?

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You'll get a code saying so, or
you'll have stumbling in the engine or
a vacuum leak that is audible.

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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I have a 1999 toyota camry 4 cylinder with the check engine light code of p0401 and i replaced the EGR valve and still have a problem, what else may it be?


there is also a vac. switching valve for the egr that also goes bad.to find the valve follow the vac. line that is hooked to the top of the egr to the valve.it is located on the back of the motor up under the intake and is a pain to replace. if you have a hand held vac. pump hook it to the egr valve and pump it up and see if the engine dies if it does i would replace the vac. switching valve.if it does not die then i would start looking for carbon on the inside of the intake on the back side of the throttle body plate.and also carbon will build up at the intake where the egr bolts to it...before i messed with the vac. switch i would look inside of the throttle body behind the throttle plate and see if the passage that goes to the egr valve is stopped up with carbon and you will need a small round mirrow and a flashlight....if the car does not die when you do the vac. pump test it is easier to take the throttle body off to clean and to check....been working on toyota and lexus for 25 yrs and have seen it all so let me know if i can help in any other way..........good luck and if i did my job let me and fixya know and a thumbs up............thanks.......

Jun 21, 2011 | 1999 Toyota Camry

1 Answer

The computer said the ekg valve was reason check light was on


Engine size???? EGR??? there can be several reasons, check all EGR components, EGR valves themselves rarely go bad, there is a transducer and solenoid valve that goes bad a lot.

Oct 16, 2009 | 1996 Dodge Caravan

2 Answers

Check engine light comes on and off, auto zone test read back EGR flow insufficient/manufact.specif.DTC/see service manual.what does any of that mean?HONDA ACCORD 4CYL.2001


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. When the EGR valve goes bad, it must be replaced.

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 acceleration.

Here is a picture of where the EGR Valve is located (Accord 1999). Replacing it is fairly simple and straightforward. A vacuum line and a couple of bolts. You'll see what you have to do when you look at it.

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If you are replacing the EGR Valve due to the Check Engine Light (MIL) being on with a DTC P0401 then I suggest contacting your Honda Dealer. There was a Product Update Campaign (PUD) in the fall of 1999 that corrected the problem.

Another times, the clean is the solution...I hope help yoiu with this. Good luck, and remember rated this help.

Sep 03, 2009 | 2001 Honda Accord

3 Answers

Code p0406 dodge grand caravan 3.8 engine. Is it the EGR valve or the O2 sensor?


P406 is a EGR code, EGR will also cause a knocking/ pinging sound when there bad. Very common problem. The position sensor inside the valve goes bad. Your going to have to replace the whole EGR valve and it can put out variety of codes from P0401 to P0406. The new valve will solve the problem and easy to replace, you can pick one up at Auto Zone and they can give you the step by step instructions to replacing the EGR with common tools. Good luck and hope this helps.

Jul 06, 2009 | 2005 Dodge Caravan

1 Answer

Egr valve replacement


two bolts and a vacuum line will take the EGR valve out .. then when you have it out you can look down there where it came out and see if it needs cleaned or not .. Probably not.. The EGR valve sometimes goes bad and causes your car to stall at stop signs or when you just let off of it... holler if you need more Jerry

May 12, 2009 | 2001 Chevrolet Impala

1 Answer

Need buick century egr diagram


If your car runs bad with an EGR code then I would suggest that the EGR valve be replaced. I would like to know what code was set on your computer. It would help greatly. When the EGR malfunctions, you will have rough idle and possible stalling. If you have a code indicating EGR it may also condem the cat converter.Please show any codes that are set. Thanks Moe

Apr 24, 2009 | 2000 Buick Century

3 Answers

FAILED EGR VALVE


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.

    Apr 15, 2009 | Chevrolet Impala Cars & Trucks

    1 Answer

    EGR valve on my 1995 Chevy s10


    up on manifold but most are vacuum operated check again to make sure a solonoid operates this device .. usually when the egr valve goes bad the vehicle dies at intersections or stopping

    Jan 26, 2009 | 1995 Chevrolet S-10 CA Edition

    1 Answer

    Engine service light


    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.

    Sep 30, 2008 | 2001 Ford Mustang

    1 Answer

    Stuttering prob


    my father used to have the same problem....its a sensor tht commonly goes bad on ford diesels i have to go and find teh name of teh sensor but i know it costs around $150 to replace....and once its gone bad once itll go bad more frequently.

    Sep 30, 2008 | 2004 Ford F250

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