DTC Codes and A/C Problems.
 

I have an 2001 Audi TT Quattro and am having technical problems. For awhile green foam was blowing out of my A/C air vents. Nothing else appeared wrong; however, now air will not blow out of my center air vents and very little out the sides. You can hear the fan blowing, but no air. My check engine light also came on. I hooked up my code reader and got the codes
16955- I have no idea what that one is
16487- Mass or volume air flow circuit- high input
16795- secondary air injection system (B2) - Incorrect flow

Are these problems related?
And if not is it something I need to get it into the shop right away?

It sounds like your A/C fins broke where the fan blows the cold air off into the car and then clogged the air directors so they probably wont open/close to direct the air the right way. That green stuff is A/C oil and dye.

16955- Bad Brake Switch

16847- Check your MAF sensor
16795- VAC line maybe

Id say 16847 and 16795 might be related id replace my MAF first, they might not be though too id just start with the MAF. 16955 is unrelated but youd wanna fix it (Brake light doesnt work, and it will make drive by wire cars act goofy cause it thinks your hitting the brakes and the gas at the same time). The A/C stuff doesnt have anything to do with it.