check the hose from the back of the auquator,to the air intake,they can hair line split.
if you cant find any cracks then elimernate that hose and so on!
i have had that fault code on my lcr and/it pointed me to d/v,take of the hose if nesscary,and have a real good look if you were closer i would give you a hand, but no chance of that.
also check boost gauge hose.............