Question about 1996 Audi A4

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My car dies and it throughs a code for the egr valve and the cateledic converter is it a common problem

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Sounds like the EGR valve is stuck in the open position which will cause it to idle very low and very rough.If you can drive it up 50 mph or more and the motor smoothes out then take the EGR valve off and clean the carbon out of it with a non-chlronated brake cleaner and wire brush or replace it with a new one.

Posted on Feb 17, 2012

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I have a 0402 fault code on my 16 hid xsara what does that mean?


OBD II Fault Code
  • OBD II P0402
Fault Code Definition
  • Excessive EGR Flow
Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
Common Problems That Trigger the P0402 Code
  • Excessive Vacuum signal or Electrical signal to the EGR Valve
  • The EGR Valve is defective and is opening too far or not properly closing
  • Lack of proper EGR system feedback to the computer from the:
    • Manifold Absolute Pressure Sensor (MAP)
    • EGR Temperature Sensor
Common Misdiagnoses
  • Ignition System
  • Fuel System
  • Oxygen Sensor
  • EGR Valve

Oct 31, 2016 | Cars & Trucks

1 Answer

96 cutlass supreme will not pass emission in ut. what should I do? KOER failed, trouble code po401


cleanout egr valve and troutle body . Or replace egr with new one, clean, check vacumm lines , check for clogged check , depending on modle of car you can pippoint problem as some have a common part problem depeding with make of car. But all have to do with exaust system. Insufficient flow exaust flow. Im not an expert, all I know it is related to this, I have it myself so im googling it.

Ford EGR valve

The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. Read more how the EGR system works below. What could cause the code P0401 - clogged or restricted EGR passages
- faulty EGR valve
- EGR valve stuck closed
- problems with the DPFE sensor (Ford)
- problems with hoses to the DPFE sensor (Ford)
- problem with the EGR vacuum switching valve (Toyota)
- clogged catalytic converter
- carboned up EGR temperature sensor
- vacuum supply issues at the vacuum-operated EGR valve
- electrical problems with the EGR valve control circuit
- engine computer problems
helpful website helps you with pinpoint and sou;ution related to auto make and model shows you most common cause of code reading.
www.samarins.com

Apr 16, 2013 | Cars & Trucks

1 Answer

My car dies and it gives codes for egr valve and cat converter how do I tell witch one


with age of car probly both need replacin--but inspec egr 1st-its common to hav an internal vacuum leak-which stalls car at low speeds----if u change the cat-after market ones dont work

Feb 17, 2012 | 1996 Audi A4

1 Answer

I replaced egr valve code 401 still comes up on my scanner. why?


The code P0401 is often not a problem with the EGR valve itself. Rather, the EGR system is not allowing enough EGR to flow back into the combustion process to sufficiently cool the peak firing temperatures. Once the code P401 has been retrieved with a scan tool, the freeze frame data should be documented and analyzed in order to determine what engine conditions were present when the code was triggered. It is recommended that the vehicle be driven in such a way as to duplicate the code setting conditions with a data streaming scan tool connected, so the behavior of the EGR actuating components and feedback sensors can be monitored.
Common Tests to Determine Whether the Problem Is an EGR Control Problem, a Plugged or Restricted System, or a Defective Feedback Device
  • Does the engine die, not just stumble, when the EGR valve is manually raised to its maximum?
    (Use either a vacuum pump or bi-directional scan tool if it's a digital EGR valve.)
  • Is the EGR valve getting sufficient vacuum? (Use the manufacturer EGR vacuum spec.)
  • Is the EGR system restricted? (The engine stumbles, but does not die.)
  • Is the EGR system plugged? (Engine RPM does not change.)
  • Does the EGR valve work?
  • Raise the RPM to 3000 and check manifold vacuum. Then open the EGR valve to its maximum-the manifold vacuum should drop by at least 3" of mercury. If it does not, there is a flow and/or restriction problem.
  • Test the EGR temperature sensor (if equipped) with a propane torch and a DVOM.
  • Test the accuracy of the EGR valve position sensor with a scan tool or DVOM by raising or lowering the EGR valve.
  • Test the Digital EGR Pressure Feedback Sensor (DPFE) with a data streaming scan tool to verify that the voltage or lift percentage changes according to spec.
  • Verify that the front Oxygen Sensor readings drop and the Short Term Fuel Trim increases when the EGR valve opens. (EGR leans out the mixture.)

Mar 29, 2011 | 2000 Pontiac Grand Am GT

1 Answer

EGR sensor replacement


EGR valves were a common failure item for the 05 Caravans. Ours died at 42k miles.

The sensor and valve are serviced as a unit. Expect to pay $150-200 to have it done, or you can DIY or less than $100.

Jul 06, 2010 | 2005 Dodge Caravan

2 Answers

1999 toyota RV4 code P0401 EGR is good ,   vacuum line is good , what parts could be check.


It means that the egr valve is working, the problem is a very common one, it's the egr modulator valve and to some extent the vacuum switching valve(VSV) for the egr valve, the modulator is attached to the egr valve, remove it and if air can pass from the bottom port through it is defective, in that case replace it and see if it takes care of the problem, if the valve is ok the egr
vsv should be replaced.

Feb 13, 2010 | 1999 Toyota RAV4

2 Answers

P0401,P 0420, CODE IN HONDA ODYSEY


P0401- Bad EGR valve
P0420- Most likely cause is a bad O2 sensor(s) at the catalytic converter

Sep 08, 2009 | 2001 Honda Accord

1 Answer

1992 chevy corsica runs rough,stall or dies after stopping


Sounds the EGR valve and EVP sen is bad even if you tested it. The EGR valve cntrols idle and if carbon up will make the car stall or idle high and low (rpms going up and down) This was common on all cars during that time. I would say replace the EGR valve and senosr. This should take care of the problem. One more thing have the fuel pressure check on the car.

Mar 20, 2009 | 1992 Chevrolet Corsica

1 Answer

2001 toyota camry le check eng. light on


Hello, and welcome to FixYa.
Please allow me to provide assistance to you.

The P-0401 code indicates an issue with the EGR valve. Normally, the most common problem is that the EGR valve sticks slightly, in the open position. To correct this condition, and to eliminate a potential for the engine to start stalling, when the valve finally sticks fully open, is to replace the EGR valve, the EGR transducer, and the EGR vacuum switching valve. This is a very common problem, and easy to rectify.

Thanks for choosing FixYa for assistance.
The graciousness of a FixYa rating for my input would be greatly appreciated.
Thanks in advance.

Jan 25, 2009 | 2002 Toyota Camry

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