Toyota Prius owners have reported a total of 16,253 problems for their cars built in the 27 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the Toyota Prius. The 2010 Toyota Prius cars have the most problems reported (3,456 problems).
The following chart shows the 33 most common problems for Toyota Prius cars. The number one most common problem is related to the vehicle's service brakes, hydraulic (4,735 problems). The second most common problem is related to the vehicle's exterior lighting (3,531 problems).
It would not be fair to compare the Toyota Prius of an older model year to newer model years since older vehicles have been in service longer and thus are expected to have more problems. In order to compare the reliability across Prius model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index indicates greater reliability of the given model year cars.
PPMY = P / S / Y * 1000,
where P = total problems reported during the life of a Toyota Prius model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).
The results are shown in Table 3.
Another way to measure the reliability across the model years of the Toyota Prius is to use the total number of problems reported during the vehicle's first year in service, as shown in the Table 4.
| Model Year | Problems Reported |
|---|---|
| 2026 Prius | |
| 2025 Prius | |
| 2024 Prius | |
| 2023 Prius | |
| 2022 Prius | |
| 2021 Prius | |
| 2020 Prius | |
| 2019 Prius | |
| 2018 Prius | |
| 2017 Prius | |
| 2016 Prius | |
| 2015 Prius | |
| 2014 Prius | |
| 2013 Prius | |
| 2012 Prius | |
| 2011 Prius | |
| 2010 Prius | |
| 2009 Prius | |
| 2008 Prius | |
| 2007 Prius | |
| 2006 Prius | |
| 2005 Prius | |
| 2004 Prius | |
| 2003 Prius | |
| 2002 Prius | |
| 2001 Prius |