should i change my entire egr system with a replacement from the junkyard on 1995 Volkswagen Cabrio

i changed the exhaust manifold, but it rattles, my egr malfunction code is up with the check the engine light,are they related? if not, my egr got so hot oil came out of it, and i think its fried

Asked by for the 1995 Volkswagen Cabrio
no you have a used system now