Hello from Hemel Hempstead, Hertfordshire

Joined
November 23, 2020
Messages
5
Been having a few problems with car since PO404 issue, cleaned egr, patch up hole in exhaust until I can get a new one. Was fine for about 4-5 days, roughly 20 miles done, then just started dying on me when coming to a stop or car was still trying to drive when I come to a stop (car was pulsing as if ECU didn't know what to do)
 

corsaZ22se

Senior Member
Joined
December 12, 2012
Messages
2,408
Hello and welcome to Z22SE.
You are not that far from me as I'm near Thame.
I would guess that the EGR valve has failed. It's quite common given the age of the engine now. And as many will tell you cleaning is a temporary fix. Replacement is the answer using OEM parts (pierburg is the OEM for this part) as pattern parts generally do not work well on the Z22SE engine and usually cause as many faults as they fix.
Here is a guide to checking the P0404 fault code,
https://www.obd-codes.com/p0404
 

KevinH

Senior Member
Joined
May 22, 2007
Messages
1,035
Hi and welcome to the site. :)

As mentioned above, if cleaning doesn't resolve the issue replacement is the only real fix, unless you buy a blanking plate and cheater, but allegedly the ones available from ebay are not too reliable. This site used to sell them but demand dwindled as the cars & engines got older.

The genuine GM part # is:
12569552 - Valve,Assy.,Exhaust Gas Recirculation (appx £200 from Vauxhall dealers)

PIerburg OEM part (as mentioned above) - £129.42 from AutoVaux
https://www.autovaux.co.uk/catalogsearch/result/?q=12569552

Hope that helps. (y)
 

corsaZ22se

Senior Member
Joined
December 12, 2012
Messages
2,408
They have shot up in price :eek:
Last time I got one was 5 years ago and it only cost £60 for the OEM one. £80 from GM.
 
Joined
November 23, 2020
Messages
5
Hello and welcome to Z22SE.
You are not that far from me as I'm near Thame.
I would guess that the EGR valve has failed. It's quite common given the age of the engine now. And as many will tell you cleaning is a temporary fix. Replacement is the answer using OEM parts (pierburg is the OEM for this part) as pattern parts generally do not work well on the Z22SE engine and usually cause as many faults as they fix.
Here is a guide to checking the P0404 fault code,
https://www.obd-codes.com/p0404

Hi, thanks for the info. I have since replaced the EGR valve, topped up the oil, topped up coolant as was a little low, checked the plugs. Once the car has warmed up, still trying to die when you come to a stop. EML has not come on again though. I am going to replace the centre and back box.
 

corsaZ22se

Senior Member
Joined
December 12, 2012
Messages
2,408
How does the car drive in general?
Is it just when pulling up at a junction it wants to stall?
 

ob one

Regular Member
Joined
April 26, 2011
Messages
156
might be worth checking the servo non return valve and pipes for any leaks they can cause air leak when braking
 
Joined
November 23, 2020
Messages
5
How does the car drive in general?
Is it just when pulling up at a junction it wants to stall?
Yes just when you slow down and come to a stop it tries to die or dies. As it's an auto you can't just put your foot on clutch and try to rev car. I have just purchased a genuine Pierburg EGR valve now so it should sort the problem.
 
Joined
November 23, 2020
Messages
5
So today I have fitted the new Genuine Pierburg EGR valve, still have the same issue,car wants to die when coming to a stop or if sat with car running and turn on A/C the car just starts dropping in rpm till it dies. Tick over is usually 750rpm, it keeps dropping below this slightly then picks back up. Sometimes when put in gear either drive or reverse the rpm drops and tries to die also. Most of the time it recovers but sometimes just dies. OBD code was PO404#11. This was cleared and EML hasn't come back on again. Any advice would be gratefully received as this is driving me nuts!! Every mechanic is saying same thing, replace EGR, but it's still doing it, TIA.
 
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