31 problems have been reported for the 2004 Audi TT. The following chart shows the 8 most common problems for 2004 Audi TT. The number one most common problem is related to the vehicle's power train with 17 problems. The second most common problem is related to the vehicle's electrical system (5 problems).
| Problem Category | Number of Problems |
|---|---|
| Power Train | |
| Electrical System | |
| Other Fuel System | |
| Equipment | |
| Air Bag | |
| Tire | |
| Electronic Stability Control | |
| Engine And Engine Cooling |
In our research we use the PPMY index to compare the reliability of vehicles. The PPMY index of a certain model is defined as the problems reported per thousand vehicles per Year. The total sales of the 2004 Audi TT in the United States are 5,870 units [1]. If the total number of problems reported by Audi TT owners in the last 18 years is 31, and the age of the vehicle is 18, the PPMY index can then be calculated as
PPMY Index = 31 / 5,870 / 18 * 1000 = 0.29.
For more information, refer to this page: A study of reliability comparison across Audi TT model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Audi TT in 2004.
| Service Year | Number of Problems |
|---|---|
| 2022 | |
| 2021 | |
| 2020 | |
| 2019 | |
| 2018 | |
| 2017 | |
| 2016 | |
| 2015 | |
| 2014 | |
| 2013 | |
| 2012 | |
| 2011 | |
| 2010 | |
| 2009 | |
| 2008 | |
| 2007 | |
| 2006 | |
| 2005 | |
| 2004 |
When making the decision between buying a new or used Audi TT, the following table can be used to compare the 2004 Audi TT with the Audi TT from other model years. Note that the number of problems reported for the 2004 TT is 31 while the average number of problems reported for the 16 model years of the Audi TT is 22.