23 problems have been reported for the 2003 Infiniti QX4. The following chart shows the 9 most common problems for 2003 Infiniti QX4. The number one most common problem is related to the vehicle's suspension with 8 problems. The second most common problem is related to the vehicle's structure (5 problems).
| Problem Category | Number of Problems |
|---|---|
| Suspension | |
| Structure | |
| Service Brakes | |
| Steering | |
| Power Train | |
| Engine And Engine Cooling | |
| Visibility | |
| Air Bag | |
| Other Fuel 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 Infiniti QX4 in the United States are 7,718 units [1]. If the total number of problems reported by Infiniti QX4 owners in the last 19 years is 23, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 23 / 7,718 / 19 * 1000 = 0.16.
For more information, refer to this page: A study of reliability comparison across Infiniti QX4 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2003 Infiniti QX4 in 2003.
| Service Year | Number of Problems |
|---|---|
| 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 Infiniti QX4, the following table can be used to compare the 2003 Infiniti QX4 with the Infiniti QX4 from other model years. Note that the number of problems reported for the 2003 QX4 is 23 while the average number of problems reported for the 9 model years of the Infiniti QX4 is 39.