Help with 17963 error code

[DanJ91]

Hi all I've recently changed my n75 valve on my aum after changing my TIP and dv to forge ones and the car pulls fine until i hit 3k revs and then it feels like it goes into limp mode. I've scanned with vag com and i get 17963 error code. Also the car is on the standard map and I've done an n249 bypass (trying to give as much info as possible) I've done alot of searching but haven't found anyone with the same symptoms as mine so any help would be appreciated.

Thanks 

[toby2can]

17963/P1555/005461
Contents

    1 17963/P1555 - Boost Pressure Control: Upper Limit Exceeded
        1.1 Possible Symptoms
        1.2 Possible Causes
        1.3 Possible Solutions

17963/P1555 - Boost Pressure Control: Upper Limit Exceeded
Possible Symptoms

    Reduced power output
    Limp mode

Possible Causes

    Boost Pressure too High
    Hoses/Pipes incorrect connected, disconnected, blocked or leaking
    Charger Pressure Control defective
        VNT (variable nozzle turbo): nozzles stuck
    Solenoid Valve for Boost Pressure Control (N75) defective

Possible Solutions

    Check Hoses/Pipes to/between Components
    Check Solenoid Valve for Boost Pressure Control (N75)
    Check / Clean / Replace Charge Pressure Control
        Check / Clean mechanism for variable nozzles

Category:

    Fault Codes

hopefully this mite help a bit

[DanJ91]

yeah I've had a look at this and can't see anything wrong with pipework etc so im stumped