127 problems have been reported for the 2001 Audi TT. The following chart shows the 17 most common problems for 2001 Audi TT. The number one most common problem is related to the vehicle's electrical system with 70 problems. The second most common problem is related to the vehicle's air bags (10 problems).
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 2001 Audi TT in the United States are 21,038 units [1]. If the total number of problems reported by Audi TT owners in the last 24 years is 127, and the age of the vehicle is 24, the PPMY index can then be calculated as
PPMY Index = 127 / 21,038 / 24 * 1000 = 0.25.
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 2001 Audi TT in 2001.
| Service Year | Number of Problems |
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| 2025 | |
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| 2001 |
When making the decision between buying a new or used Audi TT, the following table can be used to compare the 2001 Audi TT with the Audi TT from other model years. Note that the number of problems reported for the 2001 TT is 127 while the average number of problems reported for the 16 model years of the Audi TT is 22.