12 problems have been reported for the 2003 Porsche 911. The following chart shows the 6 most common problems for 2003 Porsche 911. The number one most common problem is related to the vehicle's equipment with 7 problems. The second most common problem is related to the vehicle's wheels (1 problem).
| Problem Category | Number of Problems |
|---|---|
| Equipment | |
| Wheel | |
| Power Train | |
| Seats | |
| Engine And Engine Cooling | |
| Electrical System |
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 2003 Porsche 911 in the United States are 10,040 units [1]. If the total number of problems reported by Porsche 911 owners in the last 22 years is 12, and the age of the vehicle is 22, the PPMY index can then be calculated as
PPMY Index = 12 / 10,040 / 22 * 1000 = 0.05.
For more information, refer to this page: A study of reliability comparison across Porsche 911 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2003 Porsche 911 in 2003.
| 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 | |
| 2003 |
When making the decision between buying a new or used Porsche 911, the following table can be used to compare the 2003 Porsche 911 with the Porsche 911 from other model years. Note that the number of problems reported for the 2003 911 is 12 while the average number of problems reported for the 27 model years of the Porsche 911 is 5.