Another day, another issue on my 2002 Audi TT. If you own a Mk1 Audi TT, you’ve probably got your hands full with issues under the hood. The most common problem considering these cars are about two decades old now is aged rubber hoses in the engine bay. OEM rubber hoses are an ideal replacement for these hoses, but using universal hoses tend to be more economical and can still be decent replacements.

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.

From the moment I bought my Audi TT, I had a hard time pulling the oil dipstick because the handle on it had broken off. To make matters worse, when I replaced the broken N249 hoses under the hood, the oil filler tube broke off when I was removing the N249 bracket. It’s probably no surprise that these parts break since they are plastic parts that are constantly exposed to heat in the engine bay.

When your intake manifold gasket fails, it can lead to an air leak that affect engine performance. This results in loss of power and can cause emissions issues, such as throwing a check engine light, produce rough idle, and elevate engine temperature. On the MK1 Audi TT, it is a little bit of a pain to get to remove the intake manifod, so I wouldn’t recommend replacing it unless you’re already experiencing related issues on your car.

The side marker lens on the Mark I Audi TT (model years 2000-2006) is a simple part that clips into the side of the front fender. To replace this lens is really simple, but you won’t know that unless you know how to remove it. Since the side marker lens on my TT was cracked, I got a replacement part and wanted to write a quick little tutorial to help anyone who is looking to do the same job. If you need to change out a burnt out bulb, it will also require taking the lens cover off to replace the bulb.

If you get a P1548 DTC code on your Audi TT, you may want to look at troubleshooting your N75 valve or even replacing it outright. In my experience, the cost of a replacement N75 valve is not much so it may be worth it to just replace it outright. I say this because even testing the N75 valve may show that it is working, but it may still be cause your P1548 code and be the contributer to your boost issues.

If you’ve ever had to replace the car battery in your MK1 Audi TT, you may have turned your car back on and found the word “SAFE” on the screen of your radio. This message comes up the first time you start your vehicle any time your car is disconnected from the battery. You’ll need to enter your 4 digit code into your radio to bypass the “SAFE” screen.

Getting the stock radio out of the the Mark I Audi TT can be a real pain if you don’t know how to do it and also don’t have the right tools. If you are equipped with the proper tools and the knowledge to remove your radio, it is actually quite easy to do. I’ve made this short tutorial to aid you in the removal of the radio on your 2000-2006 Audi TT, in the case that you need help in doing so.

If your MK1 Audi TT is experiencing a constant clicking noise, there are two reasons why it happens. The first reason is a faulty hazard light switch, which is the easier of the two to address. The second reason is due to a faulty turn signal switch, which is a slightly more involved repair.