327 problems have been reported for the 2004 Mini Cooper. The following chart shows the 17 most common problems for 2004 Mini Cooper. The number one most common problem is related to the vehicle's steering with 246 problems. The second most common problem is related to the vehicle's power train (27 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 Mini Cooper in the United States are 3 units [1]. If the total number of problems reported by Mini Cooper owners in the last 21 years is 327, and the age of the vehicle is 21, the PPMY index can then be calculated as
PPMY Index = 327 / 3 / 21 * 1000 = 5190.48.
For more information, refer to this page: A study of reliability comparison across Mini Cooper model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Mini Cooper in 2004.
| Service Year | Number of Problems |
|---|---|
| 2025 | |
| 2024 | |
| 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 Mini Cooper, the following table can be used to compare the 2004 Mini Cooper with the Mini Cooper from other model years. Note that the number of problems reported for the 2004 Cooper is 327 while the average number of problems reported for the 25 model years of the Mini Cooper is 110.