108 problems have been reported for the 2021 Nissan Altima. The following chart shows the 16 most common problems for 2021 Nissan Altima. The number one most common problem is related to the vehicle's forward collision avoidance with 21 problems. The second most common problem is related to the vehicle's electrical system (19 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 2021 Nissan Altima in the United States are 109,261 units [1]. If the total number of problems reported by Nissan Altima owners in the last 5 years is 108, and the age of the vehicle is 5, the PPMY index can then be calculated as
PPMY Index = 108 / 109,261 / 5 * 1000 = 0.20.
For more information, refer to this page: A study of reliability comparison across Nissan Altima model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2021 Nissan Altima in 2021.
| Service Year | Number of Problems |
|---|---|
| 2026 | |
| 2025 | |
| 2024 | |
| 2023 | |
| 2022 | |
| 2021 |
When making the decision between buying a new or used Nissan Altima, the following table can be used to compare the 2021 Nissan Altima with the Nissan Altima from other model years. Note that the number of problems reported for the 2021 Altima is 108 while the average number of problems reported for the 30 model years of the Nissan Altima is 649.