23 problems have been reported for the 2004 Audi A8. The following chart shows the 11 most common problems for 2004 Audi A8. The number one most common problem is related to the vehicle's electrical system with 4 problems. The second most common problem is related to the vehicle's visibility (4 problems).
| Problem Category | Number of Problems |
|---|---|
| Electrical System | |
| Visibility | |
| Vehicle Speed Control | |
| Service Brakes | |
| Suspension | |
| Other Fuel System | |
| Electronic Stability Control | |
| Engine And Engine Cooling | |
| Parking Brake | |
| Gasoline Fuel System | |
| Seats |
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 A8 in the United States are 7,667 units [1]. If the total number of problems reported by Audi A8 owners in the last 18 years is 23, and the age of the vehicle is 18, the PPMY index can then be calculated as
PPMY Index = 23 / 7,667 / 18 * 1000 = 0.17.
For more information, refer to this page: A study of reliability comparison across Audi A8 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 A8 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 A8, the following table can be used to compare the 2004 Audi A8 with the Audi A8 from other model years. Note that the number of problems reported for the 2004 A8 is 23 while the average number of problems reported for the 24 model years of the Audi A8 is 9.