663 problems have been reported for the 2004 Volvo XC90. The following chart shows the 27 most common problems for 2004 Volvo XC90. The number one most common problem is related to the vehicle's electrical system with 154 problems. The second most common problem is related to the vehicle's power train (147 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 Volvo XC90 in the United States are 53,187 units [1]. If the total number of problems reported by Volvo XC90 owners in the last 21 years is 663, and the age of the vehicle is 21, the PPMY index can then be calculated as
PPMY Index = 663 / 53,187 / 21 * 1000 = 0.59.
For more information, refer to this page: A study of reliability comparison across Volvo XC90 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Volvo XC90 in 2004.
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When making the decision between buying a new or used Volvo XC90, the following table can be used to compare the 2004 Volvo XC90 with the Volvo XC90 from other model years. Note that the number of problems reported for the 2004 XC90 is 663 while the average number of problems reported for the 22 model years of the Volvo XC90 is 86.