409 problems have been reported for the 2009 Mercury Mariner. The following chart shows the 20 most common problems for 2009 Mercury Mariner. The number one most common problem is related to the vehicle's steering with 167 problems. The second most common problem is related to the vehicle's engine and engine cooling (56 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 2009 Mercury Mariner in the United States are 23,349 units [1]. If the total number of problems reported by Mercury Mariner owners in the last 17 years is 409, and the age of the vehicle is 17, the PPMY index can then be calculated as
PPMY Index = 409 / 23,349 / 17 * 1000 = 1.03.
For more information, refer to this page: A study of reliability comparison across Mercury Mariner model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2009 Mercury Mariner in 2009.
| Service Year | Number of Problems |
|---|---|
| 2026 | |
| 2025 | |
| 2024 | |
| 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 Mercury Mariner, the following table can be used to compare the 2009 Mercury Mariner with the Mercury Mariner from other model years. Note that the number of problems reported for the 2009 Mariner is 409 while the average number of problems reported for the 7 model years of the Mercury Mariner is 239.
| Model Year | Number of Problems |
|---|---|
| 2011 Mariner | |
| 2010 Mariner | |
| 2009 Mariner | |
| 2008 Mariner | |
| 2007 Mariner | |
| 2006 Mariner | |
| 2005 Mariner |