Please bear with me. I haven't worked on a car since my 1994 Jeep Wrangler where I was the professional "light holder" for my dad. I have a 2003 A4 1.8T Quattro. A CEL went on a few days ago and I started having idle fluctuation. After reading several posts, etc., I decided it was likely an O2 or MAF issue or vacuum hose issue. Today, I popped the hood and heard a pretty noticeable hissing sound, located it's source (see below pic for general area) and think I found the hissing hose and tightened it after sliding it up a bit. I'm resetting the code to see if that's the fix. My only question is can someone tell me if the below pic is in the general vicinity of a vacuum hose issue? It's embarrassing to admit, but I'm clueless on this engine. Thanks.


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There is a good amount of vac lines coming off the manifold there and some go in that direction. You also have the pcv system back there also that is known to leak.