52 problems have been reported for the 2021 Toyota 4Runner. The following chart shows the 15 most common problems for 2021 Toyota 4Runner. The number one most common problem is related to the vehicle's steering with 11 problems. The second most common problem is related to the vehicle's suspension (10 problems).
| Problem Category | Number of Problems |
|---|---|
| Steering | |
| Suspension | |
| Service Brakes | |
| Visibility | |
| Wheel | |
| Electrical System | |
| Equipment | |
| Forward Collision Avoidance | |
| Exterior Lighting | |
| Seats | |
| Power Train | |
| Tire | |
| Other Fuel System | |
| Air Bag | |
| Vehicle Speed 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 2021 Toyota 4Runner in the United States are 146,552 units [1]. If the total number of problems reported by Toyota 4Runner owners in the last 5 years is 52, and the age of the vehicle is 5, the PPMY index can then be calculated as
PPMY Index = 52 / 146,552 / 5 * 1000 = 0.07.
For more information, refer to this page: A study of reliability comparison across Toyota 4Runner model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2021 Toyota 4Runner in 2021.
| Service Year | Number of Problems |
|---|---|
| 2026 | |
| 2025 | |
| 2024 | |
| 2023 | |
| 2022 | |
| 2021 |
When making the decision between buying a new or used Toyota 4Runner, the following table can be used to compare the 2021 Toyota 4Runner with the Toyota 4Runner from other model years. Note that the number of problems reported for the 2021 4Runner is 52 while the average number of problems reported for the 31 model years of the Toyota 4Runner is 223.