337 problems have been reported for the 2006 Toyota Highlander. The following chart shows the 25 most common problems for 2006 Toyota Highlander. The number one most common problem is related to the vehicle's service brakes, hydraulic with 97 problems. The second most common problem is related to the vehicle's engine and engine cooling (41 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 2006 Toyota Highlander in the United States are 100,757 units [1]. If the total number of problems reported by Toyota Highlander owners in the last 20 years is 337, and the age of the vehicle is 20, the PPMY index can then be calculated as
PPMY Index = 337 / 100,757 / 20 * 1000 = 0.17.
For more information, refer to this page: A study of reliability comparison across Toyota Highlander model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2006 Toyota Highlander in 2006.
| Service Year | Number of Problems |
|---|---|
| 2026 | |
| 2025 | |
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| 2006 |
When making the decision between buying a new or used Toyota Highlander, the following table can be used to compare the 2006 Toyota Highlander with the Toyota Highlander from other model years. Note that the number of problems reported for the 2006 Highlander is 337 while the average number of problems reported for the 26 model years of the Toyota Highlander is 248.