I've lost power (Limp home mode) I've cleaned, then changed the MAF, no joy. So I've now bought an N75 valve (Also called a 'Turbo boost pressure solenoid' or 'boost pressure convertor'. Problem is I can't find the blinking thing! It should be on top of the intercooler but I can't see it. Is it hidden away there? I have a A4 B6 2002 1.9Tdi 130bhp. Going slightly mad so would appreciate any pointers please. Its clearly visible on the B5 models -left side of engine.
Valve Picture: www.cars-buyer.co.uk/Cars-Sale/0-Audi-a-24.html
Remove frame

 

http://www.audiworld.com/tech/eng70.shtml

 

Aah many thanks Pa4ul. You're a scholar! I've been on the internet for days looking. Will get onto it in the morning.

 

Limp mode now fixed. Changed MAF, changed N75. Fault wasn't either of these - turned out it was the throttle sensor. Rain water had found it's way down to the throttle assembly (Engine drainage holes were clogged up) Cleaned away oily gunk, replaced sensor and all ok.
Should have guessed -footwell carpets were sometimes damp.

 

eeeek you better make sure water dosent get into your central convience module located under the seat. Alot of people have had theirs fried when they find their carpets wet. Glad i could help.