N75 valve.

[BRILLO]

Is there anyway of testing these to find out if its faulty?

 

[czm]

Vcds?

 

[jimmcgee]

is this any use
HOW TO - Test Charge Pressure Solenoid Valve AKA N75 - VW T4 Forum - VW T5 Forum

 

[Audi Doodah]

As above. A registered verion of VCDS?VCDS Lite allows you to run engine output tests, n75/actuator being one of them. Good way of checking turbo vanes are clean as you can see smooth movement of the actuator arm.

 

[BRILLO]

Cheers guys. Had it scanned last week. Was pointing to boost pressure sensor in intercooler or n75. Changed above sensor and no change. Vcds guy now on hols so will probably need n75 as well. I can hear it making a noise as if its not sealing when driving.