13 problems have been reported for the 2009 Infiniti QX56. The following chart shows the 10 most common problems for 2009 Infiniti QX56. The number one most common problem is related to the vehicle's suspension with 3 problems. The second most common problem is related to the vehicle's electrical system (2 problems).
| Problem Category | Number of Problems |
|---|---|
| Suspension | |
| Electrical System | |
| Service Brakes | |
| Steering | |
| Exterior Lighting | |
| Structure | |
| Air Bag | |
| Equipment | |
| Other Fuel System | |
| Electronic Stability Control |
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 2009 Infiniti QX56 in the United States are 2,668 units [1]. If the total number of problems reported by Infiniti QX56 owners in the last 14 years is 13, and the age of the vehicle is 14, the PPMY index can then be calculated as
PPMY Index = 13 / 2,668 / 14 * 1000 = 0.35.
For more information, refer to this page: A study of reliability comparison across Infiniti QX56 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2009 Infiniti QX56 in 2009.
| Service Year | Number of Problems |
|---|---|
| 2023 | |
| 2022 | |
| 2021 | |
| 2020 | |
| 2019 | |
| 2018 | |
| 2017 | |
| 2016 | |
| 2015 | |
| 2014 | |
| 2013 | |
| 2012 | |
| 2011 | |
| 2010 | |
| 2009 |
When making the decision between buying a new or used Infiniti QX56, the following table can be used to compare the 2009 Infiniti QX56 with the Infiniti QX56 from other model years. Note that the number of problems reported for the 2009 QX56 is 13 while the average number of problems reported for the 10 model years of the Infiniti QX56 is 66.