3 problems have been reported for the 2004 Lexus SC. The following chart shows the 2 most common problems for 2004 Lexus SC. The number one most common problem is related to the vehicle's air bags with 2 problems. The second most common problem is related to the vehicle's equipment (1 problem).
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 Lexus SC in the United States are 9,905 units [1]. If the total number of problems reported by Lexus SC owners in the last 19 years is 3, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 3 / 9,905 / 19 * 1000 = 0.02.
For more information, refer to this page: A study of reliability comparison across Lexus SC model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Lexus SC in 2004.
| Service Year | Number of Problems |
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| 2023 | |
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| 2004 |
When making the decision between buying a new or used Lexus SC, the following table can be used to compare the 2004 Lexus SC with the Lexus SC from other model years. Note that the number of problems reported for the 2004 SC is 3 while the average number of problems reported for the 7 model years of the Lexus SC is 3.