55 problems have been reported for the 2004 Subaru Legacy. The following chart shows the 14 most common problems for 2004 Subaru Legacy. The number one most common problem is related to the vehicle's air bags with 26 problems. The second most common problem is related to the vehicle's engine and engine cooling (6 problems).
| Problem Category | Number of Problems |
|---|---|
| Air Bag | |
| Engine And Engine Cooling | |
| Vehicle Speed Control | |
| Other Fuel System | |
| Service Brakes | |
| Power Train | |
| Structure | |
| Unknown Or Other | |
| Visibility | |
| Equipment | |
| Tire | |
| Electrical System | |
| Seat Belt | |
| Suspension |
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 Legacy in the United States are 67,349 units [1]. If the total number of problems reported by Subaru Legacy owners in the last 19 years is 55, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 55 / 67,349 / 19 * 1000 = 0.04.
For more information, refer to this page: A study of reliability comparison across Subaru Legacy 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 Legacy in 2004.
| Service Year | Number of Problems |
|---|---|
| 2023 | |
| 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 Subaru Legacy, the following table can be used to compare the 2004 Subaru Legacy with the Subaru Legacy from other model years. Note that the number of problems reported for the 2004 Legacy is 55 while the average number of problems reported for the 28 model years of the Subaru Legacy is 108.