469 problems have been reported for the 2006 Toyota Highlander Hybrid. The following chart shows the 21 most common problems for 2006 Toyota Highlander Hybrid. The number one most common problem is related to the vehicle's service brakes, hydraulic with 136 problems. The second most common problem is related to the vehicle's electrical system (71 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 Hybrid in the United States are 43,921 units [1]. If the total number of problems reported by Toyota Highlander Hybrid owners in the last 20 years is 469, and the age of the vehicle is 20, the PPMY index can then be calculated as
PPMY Index = 469 / 43,921 / 20 * 1000 = 0.53.
For more information, refer to this page: A study of reliability comparison across Toyota Highlander Hybrid 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 Hybrid in 2006.
| Service Year | Number of Problems |
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| 2026 | |
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| 2006 |
When making the decision between buying a new or used Toyota Highlander Hybrid, the following table can be used to compare the 2006 Toyota Highlander Hybrid with the Toyota Highlander Hybrid from other model years. Note that the number of problems reported for the 2006 Highlander Hybrid is 469 while the average number of problems reported for the 19 model years of the Toyota Highlander Hybrid is 56.