224 problems have been reported for the 1999 Audi A6. The following chart shows the 21 most common problems for 1999 Audi A6. The number one most common problem is related to the vehicle's electrical system with 37 problems. The second most common problem is related to the vehicle's service brakes, hydraulic (26 problems).
The following chart shows the number of problems reported during each of the service years since the debut of the 1999 Audi A6 in 1999.
| Service Year | Number of Problems |
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| 2022 | |
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| 1999 |
When making the decision between buying a new or used Audi A6, the following table can be used to compare the 1999 Audi A6 with the Audi A6 from other model years. Note that the number of problems reported for the 1999 A6 is 224 while the average number of problems reported for the 25 model years of the Audi A6 is 62.