Question about 2004 Volkswagen Beetle

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Bettle problem EGR Valve was replaced and problem is still their. Help neck hurts

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  • dlpak Jul 31, 2008

    Can these be checked with a simple hook up to the machine at the shop?



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Well any decent mechanic should be able to figure out what the problem is. I would take it to a shop have them check the o2 sensor, also have them clean and check the TPS. There are quite a few things it could be. You can also take it to a VW dealer.
Hope that helps,

Posted on Jul 31, 2008

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An O2 sensor and the throttle positioning sensor can cause a surging problem also.

Posted on Jul 30, 2008

  • Ryan Rogers
    Ryan Rogers Jul 31, 2008

    The O2 sensor can be, But the throttle positioning sensor can't. There are a couple of test that a shop can do, but the test may not yield much.



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Diag codes for trouble shooting po141,po404,po440

Code 141 is the O2 (oxygen sensor) gone bad, needs replacing.
Code 440, 442 and 445 are all in the EES (Evaporative Emission System). They are leaks in the PCM (Powertrain Control Module). It tests this system when there is about one fourth tank of gas left.
This system controls fumes from the fuel by storing it in a vapor canister until they can be burned off. This system has several parts in it. You have the solenoid (which is a vent valve and a purge valve), fuel tank, a vapor canister, and you have lines coming from engine vacuum port, going to the vent valve. But you may want to check your gas cap. This is the culprit most of the time. As we take it off and on, it can cause leaks. This is also the cheapest solution. You'll have to clear your code with an OBD scan tool, to see if it was repaired by replacing your gas cap.
Also older vehicles can have a leak around the fuel filler neck where the gas cap attaches to is a seal and it could have gone bad.
A lot of times that seal is leaking around that filler neck. So more likely than not, it is leaking and/or gas cap needs replacing.
A 403, 404,405 are in the EGR System.
401 and 402 are the EGR valve.
You will get these codes because the PCM has sent them. It will send them to test the system as part of a self-diagnostic test and the other reason it sends it is because it wants to monitor the EGR system through everyday, normal operations.
This is what is known as PCM command. It is looking for correct signal of the wires to make sure they are working right from the solenoids in the EGR valve.
There is a problem in the EGR system that needs fixing. Sometimes replacing the EGR valve will fix the problem, but before you go out buying a lot of parts for your car, have a mechanic shop test the EGR system.
Good luck.

Aug 01, 2012 | 1999 Saturn SL

1 Answer

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


He's right both and the code is the EGR valve. The car won't run with the EGR valve removed but it may be disabled some way. Most of the time EGR vales leak or the senser line stopps up. There's a small medal ine coming up the the EGR senser from the exhaust and connects to the senser this line stops up and the senser knows something aught to be happing and it doesn't so it turns the light on. Your mechanic is right it's not hurting anything but it makes the light on. It can be fixed but it'll not run much different.

Dec 02, 2010 | 1999 Nissan Altima

2 Answers

What does a PO401 means for a 1998 Mercury Sable

P0401 OBD-II Trouble Code - Insufficient EGR Flow

What does that mean?
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.

You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

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

Hope this help to solve it; remember comment and rated this help. TY for using Fixya.

May 06, 2010 | 1998 Mercury Sable

2 Answers

Codes P0401 and P0441 on a 1996 98 Olds

P0401--- the egr valve has insufficient air flow. Needs to be taken off and cleaned, if not replaced. The port holes might be clogged up, or the valve itself might be bad.
P0441---- The evaporative emission control purge valve has low air flow, probably do to the egr valve.
If you take off the egr valve, you will need to replace the gasket, or it won't seal right when it's put back on.

May 05, 2010 | 1996 Oldsmobile Ninety Eight

1 Answer

P0401 egr flow all senors,ports working properly at shop with ase

check ur egr valve -there are 3 parts to the egr --the dpfe[differential pressure feedback egr ]sensor//egr valve//actuator solenoid--++biggest problem with the egr valve is that it gets carboned up and the valve is stuck remove and clean the valve and tube with a carb cleaner and check valve for movement if faulty replace also check vacuum line and vacuum to egr unit

Feb 14, 2010 | 2001 Mitsubishi Eclipse

3 Answers

Can the headrest for a 2010 ford expedition be replaced with an aftermarket so not to have that angle?

I know five (5) people who purchased the 2009 or 2010 Expedition. All 100% of them have complaints of the headrest hurting their neck. I know folks that won't even drive their new 2010 Expedition because it hurts their necks, and the dealer won't take it back! If enough people tell ford about the problem, erhaps Ford will post a Technical Service Bulletin (TSB) to tell dealers how to fix the problem. It is possible to build safe headrests that do not hurt necks during normal driving: just look at the competition. The headrest is not the right equipment to sacrifice comfort. Neck pain causes distraction and is a safety issue. Ford should be as concerned about liability from wrecks caused by headrest pian distractions as they are about the rear impact safety. Complain to Ford!

Dec 11, 2009 | 2009 Ford Focus

2 Answers

Need to know where the egr valve is located on a 2000 chevy silverado 1500 5.3 liter engine

. The EGR valve is located in front of the oil filler neck. All you need to do is remove the electrical wire from the top of the valve, there is a clip on the connector so don't try and pull it off without lifting the clip. Once the wire has been disconnected, just unbolt the two bolts holding the EGR valve on. Thats it.

Aug 16, 2009 | 2000 Chevrolet Silverado

1 Answer

DTC P0404 stored on my 2006 Grand Caravan SXT..

You need to replace the EGR valve. It may or may not hurt the driveability. When mine went bad, I noticed bucking at lower RPM's which may or may not hurt something.

Jun 10, 2009 | 2006 Dodge Grand Caravan

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