224 problems have been reported for the 2021 Toyota Sienna. The following chart shows the 22 most common problems for 2021 Toyota Sienna. The number one most common problem is related to the vehicle's service brakes, hydraulic with 79 problems. The second most common problem is related to the vehicle's equipment (26 problems).
The following chart shows the number of problems reported during each of the service years since the debut of the 2021 Toyota Sienna in 2021.
| Service Year | Number of Problems |
|---|---|
| 2026 | |
| 2025 | |
| 2024 | |
| 2023 | |
| 2022 | |
| 2021 |
When making the decision between buying a new or used Toyota Sienna, the following table can be used to compare the 2021 Toyota Sienna with the Toyota Sienna from other model years. Note that the number of problems reported for the 2021 Sienna is 224 while the average number of problems reported for the 30 model years of the Toyota Sienna is 370.