I swear, everytime I am working on something under the hood on my 2002 Audi TT, I find another issue that I need to address. The most recent thing I noticed is this y-shaped breather hose that is deteriorated and cracked. If you have a MK1 Audi TT, then you probably know that because of the age of these cars, many of the rubber hoses under the hood will break over time.