94 problems have been reported for the 2001 Infiniti QX4. The following chart shows the 18 most common problems for 2001 Infiniti QX4. The number one most common problem is related to the vehicle's equipment with 23 problems. The second most common problem is related to the vehicle's structure (16 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 2001 Infiniti QX4 in the United States are 33,145 units [1]. If the total number of problems reported by Infiniti QX4 owners in the last 21 years is 94, and the age of the vehicle is 21, the PPMY index can then be calculated as
PPMY Index = 94 / 33,145 / 21 * 1000 = 0.14.
For more information, refer to this page: A study of reliability comparison across Infiniti QX4 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2001 Infiniti QX4 in 2001.
| Service Year | Number of Problems |
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| 2001 |
When making the decision between buying a new or used Infiniti QX4, the following table can be used to compare the 2001 Infiniti QX4 with the Infiniti QX4 from other model years. Note that the number of problems reported for the 2001 QX4 is 94 while the average number of problems reported for the 9 model years of the Infiniti QX4 is 40.