hi all , on my zafira 1.9cdtyi a pipe i leaking oil as it is joining a round shaped like tank?, the rubber hose when pulled out has a round plastic around it that slides off a long copper tube ?, what is it?, i have no idea what its called and what its for its showing up a p2279 fault code, air intake leak vacuum leak, sligh power loss as into limp mode, but its not a lot of oil but just dont know hpw to fix, it seems like a retunr maybe as black oil on copper tube when i pulled out it just slid up and out, any help please
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