I see where you are going with that, but I have had them in with no limp mode and code, ever, and TOTALLY seized vnt. Because the VNT was seized in low boost. If it gets sticky prior to seizing, it can 'flip' between getting stuck on high boost and getting stuck on low boost, creating some strange symptoms.

I like to put a vacuum pump on the actuator, manually operate it and take the readings - that's pretty conclusive as far as the vanes go.

Greg.

:iagree:

This is the test you need to do. I suspect that it is the solenoid, rather than sticking vanes. Either way this test will tell you

so I need someone with a VAG COM thingy.

Will have a dig. Not done it sice, and never done it while warm, only done it after around 30 seconds (similar to the time it "coughs" under acceleration)