113 problems have been reported for the 2004 Subaru Impreza. The following chart shows the 19 most common problems for 2004 Subaru Impreza. The number one most common problem is related to the vehicle's fuel system, other with 25 problems. The second most common problem is related to the vehicle's suspension (17 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 Subaru Impreza in the United States are 39,381 units [1]. If the total number of problems reported by Subaru Impreza owners in the last 21 years is 113, and the age of the vehicle is 21, the PPMY index can then be calculated as
PPMY Index = 113 / 39,381 / 21 * 1000 = 0.14.
For more information, refer to this page: A study of reliability comparison across Subaru Impreza model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Subaru Impreza in 2004.
| Service Year | Number of Problems |
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| 2025 | |
| 2024 | |
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| 2004 |
When making the decision between buying a new or used Subaru Impreza, the following table can be used to compare the 2004 Subaru Impreza with the Subaru Impreza from other model years. Note that the number of problems reported for the 2004 Impreza is 113 while the average number of problems reported for the 29 model years of the Subaru Impreza is 107.