Signum 2.0 dti fault codes

[Babycake]

hello

i am hoping someone may be able to shed a bit of light on the two error codes i have had come up on my ecu, one is the T0638 code which i have read some bits about it but not too clear on what it could be.

the other code i have on my ecu is t0234, according to the garage this can either mean a split hose, the wastegate valve or the actual wastegate,

My signum has only done 100k is it a common problem for the waste gate to go??

any help on this would be a huge help as i don;t want the garage to rip me off

[dh.dti]

Do you mean P0234 & P0638 ? as i'm not familiar with tcodes.

my first thoughts are:

check all vac tubes & connectors for splits & or make sure they're connected properly along with check the pumps are also working... these are common on all dti engines

[Daywalker]

my first check would be all the small vacumm hose rubbers and also the big boost hoses

[bobssignum]

Po234 is boost pressure control circuitpositive deviation
Po638 is throttle control circuit negative deviation

as above with checking for split hoses especially the connectors on the small vacuum hoses .
po234 is telling you have a faulty boost pressure sensor , or what is generally the case it is covered in crud from the manifold which is stopping it working , remove and clean with carb cleaner should see it resolved ,follow the how 2 for guidance.
po638 again relates to exhaust manifold that houses the sensor remove the manifold clean out with carb cleaner should see a vast improvement .
while your there you might as well clean the egr valve as well as the faults above are often linked to choked egr as well , there are numerous thread on here showing you how to clean egr valves for dti engine ,s along with guide,s for the other fault,s

[Babycake]

thanks for the comments, as i have no idea on how to take the engine apart even with the how too's its going back to the garage on friday, just a bit worried as the bloke is getting someone else in to have a look at it as he is not that well up on fault codes so i am going to take this info in with me and get them to check them bits first fingers crossed it doesn't cost me a samll fortune !!

Thanks again