hi to all i have been told by a mechanic that my wastegate stays in the open position thats why i have my boost/limp mode problem just wanted to know a few things
my car is an audi a4 afn 1.9 tdi 110

a)is the turbo a garretts vnt15
b)can the wastegate be sorted out without changing the turbo
c)should i get a second hand turbo or a reconditioned one buying a new one is out of the question
d)are there any other makes or should i stick to the original

p.s i have been through every thing else i.e pump,injectors, maf and the mechanic has said it is definately the wastegate

thanks