332 problems have been reported for the 2004 Nissan Altima. The following chart shows the 22 most common problems for 2004 Nissan Altima. The number one most common problem is related to the vehicle's engine and engine cooling with 140 problems. The second most common problem is related to the vehicle's structure (40 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 Nissan Altima in the United States are 90,498 units [1]. If the total number of problems reported by Nissan Altima owners in the last 19 years is 332, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 332 / 90,498 / 19 * 1000 = 0.19.
For more information, refer to this page: A study of reliability comparison across Nissan Altima model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Nissan Altima in 2004.
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When making the decision between buying a new or used Nissan Altima, the following table can be used to compare the 2004 Nissan Altima with the Nissan Altima from other model years. Note that the number of problems reported for the 2004 Altima is 332 while the average number of problems reported for the 28 model years of the Nissan Altima is 646.