896 problems have been reported for the 2004 Toyota 4Runner. The following chart shows the 23 most common problems for 2004 Toyota 4Runner. The number one most common problem is related to the vehicle's structure with 290 problems. The second most common problem is related to the vehicle's equipment (133 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 2004 Toyota 4Runner in the United States are 122,034 units [1]. If the total number of problems reported by Toyota 4Runner owners in the last 21 years is 896, and the age of the vehicle is 21, the PPMY index can then be calculated as
PPMY Index = 896 / 122,034 / 21 * 1000 = 0.35.
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 2004 Toyota 4Runner in 2004.
| Service Year | Number of Problems |
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| 2025 | |
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| 2004 |
When making the decision between buying a new or used Toyota 4Runner, the following table can be used to compare the 2004 Toyota 4Runner with the Toyota 4Runner from other model years. Note that the number of problems reported for the 2004 4Runner is 896 while the average number of problems reported for the 30 model years of the Toyota 4Runner is 229.