37 problems have been reported for the 2004 Audi A6. The following chart shows the 16 most common problems for 2004 Audi A6. The number one most common problem is related to the vehicle's fuel system, gasoline with 5 problems. The second most common problem is related to the vehicle's fuel system, other (4 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 2004 Audi A6 in the United States are 15,884 units [1]. If the total number of problems reported by Audi A6 owners in the last 19 years is 37, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 37 / 15,884 / 19 * 1000 = 0.12.
For more information, refer to this page: A study of reliability comparison across Audi A6 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 A6 in 2004.
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When making the decision between buying a new or used Audi A6, the following table can be used to compare the 2004 Audi A6 with the Audi A6 from other model years. Note that the number of problems reported for the 2004 A6 is 37 while the average number of problems reported for the 26 model years of the Audi A6 is 67.