pressure control valve?

[Luca12]

is that the 249 valve or the n75?

[AudiSportB5S4]

n75 is the boost regulator i can tell you that, the N249 is for "divert air valve for turbo" and the one you mentioned the Charge pressure sender is G31, it sits on top of your TBB from the bipipe.

[Luca12]

Whatever valve im talking about opens 10.2% as soon as i get on the throttle and lets all the boost out. I pull two codes, boost pressure control valve open, and charge pressure negative diviation.

[AudiSportB5S4]

sounds like an N75 if its boost related, maybe someone near you can swap N75's and see if that does the trick

[The_Jerbel]

Could be either valve, post the actual code it pulled up, with the number.

[my01s4]

sounds like a boost leak actually.

[The_Jerbel]

Yeah, it's possible, but he does have a valve problem for sure. Here's the clue: "boost pressure control valve open"

[Luca12]

ya i dont think its a boost leak b/c when its cold it builds boost then drops off at high rpm's.

[Luca12]

ok here the actual codes:

17956 p1548 boost pressure contr. valve, open.

17964 p1556 charge pressure contr., negative deviation.

[AudiSportB5S4]

i would say N75 but wait for Jerbel to answer lol he knows ALL. if it was a boost leak more than likely it would say POSITIVE deviation since their is more air than usual

[Luca12]

Thats what i think it is but wanted to check with you guys.

[The_Jerbel]

Yeah, the code you are throwing means your N75 is done, or the wiring to the N75 has a short somewhere. Try replacing the N75 and see if the code comes back after clearing it.

Also, a boost leak typically gives you a negative deviation code, not positive deviation.

[Luca12]

ok will do, thanks for your help everyone.