As previously reported, I was getting knock sensor errors (1 & 2 - signal too low - P0327 & P0332) coupled with P1386 (Internal Control Module Malfunction) so I decided to take the knock sensors off and see if cleaning them would help. In the process of getting to the knock sensors I discovered a broken vacuum line.

See where the big red arrow points...
(I grabbed this photo from Steve's Fotki so please disregard the circle around the temp. sensor.)

<img src="http://pictureposter.audiworld.com/134029/hose.jpg">

My neighbor still hasn't returned my Bentley (I broke down and ordered another one....grrrr...) but in the meantime... I really don't know what that line is or does. I do know that by replacing it, I have gotten rid of the dreaded knock sensor errors. Coincidentally, or not, the hose was broken so that the leak would have been blowing directly onto where the knock sensors plug into the wiring harness...perhaps causing the errors??

Now, the only code I get is P1386 - Int. Control Module Malfunction... hhhhmmmmm...

Also, did some readings with the VAG and figured out that cylinder 3 has been misfiring. Noticeable only under full throttle, gears 3-5, 3500+ RPMs. I just replaced the plugs but by swapping the plugs in 2 &amp; 3 (which caused the misfire to move to cylinder 2) I have discovered that I have a plug that is either bad or gapped incorrectly. I'm getting a new plug tonight.

 

Lean mix was causing the knock...Maybe you can track down that line from this:

<img src="http://images14.fotki.com/v21/photos/7/7305/225766/vacumlines-vi.jpg">

 

That pic is from my 180 ATC engine..:-)

 

looks like it might have been the line from the over-run shut-off to N249. So, any clue why I wouldn't get any "lean" codes?

 

via the ECU up to a point (Block 32 tells the tail). You may not have hit the CEL point yet..
Gotta be pretty far out of range before it throws a code..

 

Good to know. Thing had me STUMPED!!

 

Looks just like mine!!