Question about 2001 Buick LeSabre

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Hello, a few problem with my 2001..yesterday the code read P404 i just changed the EGR valve a few months ago. also the car shacks at 70mph i got new tires changed the lower control arms mounts strut mounts etc hubs stabalizer links all the parts connected to the wheels.. what gives? tune up done not long ago either trans flush done a week ago..

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P0404 may be the valve sticking or not operating correctly. I hope you bought at least a AC DELCO valve, all others are not good enough. As for the car shaking @ 70 maybe they did not balance the tires good enough, have them drive it and recommend what to do, maybe you have a bad tire.

Posted on Sep 01, 2010

Testimonial: "Thanks.. and the tire problem got better with the new tires it just didnt fix the issue.. its almost like a suspention problem too!! thanks helpful!"

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Got a 2001 Ford Taurus with 128K miles, engine was rebuilt 10 months ago, for the last 4 months it has been chugging or hesitating when I'm stopped at a light, Autozone codes said egr pressure sensor,...


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Code P404, Car wants to chug.


p0404-- egr flow range/performance--- this indicates that there is a problem with egr or curcuit, remove egr and clean carbon from base where it sits on intake. it may just be clogged with carbon. good-day !

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Replaced egr valve 2 months ago, check engine light came on yesterday code p0104 egr valve 1999 acura tl 77000 miles


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I replaced my egr valve on my 2001 chevy venture 1 1/2 yrs ago,


I found an answer that worked for me here. (I have a 2001 Chevy Venture.) http://www.fixya.com/cars/t4093012-code_p1404_dodge_ram_1500_meanIn case links are not allowed, here's the text:That code is the EGR. I'd start by checking for a bad connection on the EGR plug-in. Pull the connector off and inspect each individual terminal inside the plug and the connector pins inside the EGR valve.
I found this solution at another forum on this issue. It worked on my 2001 Grand Am:

"Many GM built cars have a tendency to have the 'Check Engine Soon' light come on as a result of DTC code P1404. P1404 is described as EGR valve pintle stuck open, which in most cases is a false alarm. I had this happen with my '01 Grand Am. A little bit surfing on internet reveals that GM has a solution for the problem, a re-flash for the car's computer.

A software re-flash as a fix kind of indicates that the vehicles with this problem were built with it but I don't think GM will be re-flashing cars outside warranty for free. They will want their $100 for it.

Some hands on people I found had purchased a new EGR valve and changed it but the problem remained.

Possible reason (very likely) for the false P1404 code is that the plastic piston of the EGR valve position instrument (LVDT?) wears over time and starts reading a different position at valve closed than what it was when the EGR valve was first installed.

When the car was built and the computer circuits energized for the first time the computer learned the EGR valve closed position signal from the valve position instrument that is built on top of the valve itself. Over time, when the instrument wears, a slightly different signal is sent to the computer and when it differs enough from the 'Valve Closed Signal', that the computer had learned, the trouble code P1404 is set and the 'Service Engine Soon' light comes on.

Replacing the EGR valve with a new one does not necessarily fix this problem because the 'Valve Closed Signal' between valves is slightly different and it is just pure luck if your new valve would give a 'Valve Closed Signal' close enough to your original valve's signal not to set the trouble code. This is why the new EGR valve 'Valve Closed Signal' must be re-learned by the computer.

So, what this all means is that if the P1404 is a false code meaning that the valve pintle is not stuck open, then new 'Valve Closed Signal' can be re-learned by the computer using the old valve.

For fixing this problem the tool you need to have is a simple OBD II code scanner that can be used to erase trouble codes. There are many scanners of different price range on the market. I purchased one from AutoZone for about $90.

A code scanner is a very handy tool to have and I recommend everybody who is just slightly hands on type of a person to get one. It will end up saving a lot of money over time.

The fix goes like this:

1. Disconnect the wire harness from the EGR valve.

2. Turn key ON and erase the trouble code(s) from the car's computer AND TURN KEY OFF IMMEDIATELY WHEN THE SCANNER SAYS CODES HAVE BEEN ERASED. DO NOT TURN KEY ON BEFORE YOU RE-CONNECT EGR WIRE HARNESS.

3. Re-connect EGR wire harness and your problem should be fixed.

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1 Answer

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The EGR is one piece in a larger system. Most autozone type places only read the code and match it with a code sheet. This does not troubleshoot the entire system. It is possible the new egr valve you repaired actually is broken. But check the Vaccuum lines and hose around the valve, if broken or loose or even missing, this would cause the same problem. Find a friend or aquaintance with a snap-on style computer to pull up the exact data you need.

Aug 01, 2008 | Ford Taurus Cars & Trucks

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Code p0404


replaced the EGR valve

Jul 05, 2008 | 2006 Chrysler Town & Country

3 Answers

Code EGR P404


Code EGR P404 is a problem with EGR (exhaust gas recirculaion), you have to replace the valve, check here for parts: partsamerica
The part costs $80/$100,. Having it done by a qualified mechanic, which is always the best choice costs around $250/$300.

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