Audi S3 P0234 overboost condition

a3 turbp

a3 turbp

Registered User
Joined
Dec 11, 2006
Messages
228
Reaction score
28
Points
28
ive recently fitted a milltek downpipe with decat married to a non resonated milltek straight through, ever since then I've had fault code for the cat which I expect until I get it mapped again but the problem I have is this P0234 overboost condition fault code. I've changed the N75 valve, map sensor and the turbo as per Ross-tech but to no avail. Does anyone know if this could be due to the fact there is no cat so ultimately there is less back pressure? If so should this be rectified by another remap to suit
 
Last edited:
I will start from checking vacuum lines and if the turbo waste gate working properly.
 
The wastgate must be working as the turbo is new, I will check the vacuum lines and see if I can see anything. Thing is though it pulls hard in the first and second right round but in third onwards it just dies after 3.5k revs
 
It's ok having the GFB DV+ but is your OEM DV part ok as that won't help if it's split in the first place?
 
nluk100 said:
It's ok having the GFB DV+ but is your OEM DV part ok as that won't help if it's split in the first place?
Click to expand...
What can split on the oem side? I thought it only used the solenoid?
 
Ok so I've just fitted my OEM diverter valve rev 'g' and took it for a drive firstly I noticed the flutter on fear change seemed a lot louder than with the GFB but also it pulled really hard through all the gears but then after about 10 mins of flying down the 'lanes' (national speed limit) its cut the boost on me whilst in fifth and now the diverted valve sounds like it may be split on gear changes. I'll take it off tomorrow after work and see if I can see if it is split. If this is the case what can I do to make the GFB work? Is it just a case of buying a new DV just for the solenoid?
 
Ok it's worth a try for the sake of £40 I suppose, hopefully it sorts it out. Thanks for your help
 
a3 turbp said:
The wastgate must be working as the turbo is new, I will check the vacuum lines and see if I can see anything. Thing is though it pulls hard in the first and second right round but in third onwards it just dies after 3.5k revs
Click to expand...


Mine does exactly this, but it is a 2.0 tdi
 
Mine turned out to be one of the vacuum hoses that goes onto the n75 valve had come off
 
  • Like
Reactions: Ollie M
Ah I see, where abouts is the n 75 valve? I assume mine would be in the same area as yours on the s3?

Cheers
 
If it is then it's on the turbo. If you take your drivers side wheel arch liner out and look up the side of the intercooler pipe you will see it, it has 3 pipes connected to it
 
  • Like
Reactions: Ollie M
You must log in or register to reply here.

Similar threads

Ron burgundy
Overboost p0234 pending
Replies
7
Views
12K
Ron burgundy
Ron burgundy
kaz219
P0234 - Turbocharger Boost Pressure Regulation: Limit Exceeded (Overboost Condition)
Replies
4
Views
29K
kaz219
kaz219
G
2.0 tdi P0234 Overboost.
Replies
25
Views
25K
JoshRowell
JoshRowell
S
Overboost P0234 A3 2.0TDI BKD 2003
Replies
6
Views
19K
scox93
S
A3jack
Audi A3 overboost problem
Replies
1
Views
472
T8DPR
T
Top
Back