133 problems have been reported for the 2003 Infiniti I35. The following chart shows the 14 most common problems for 2003 Infiniti I35. The number one most common problem is related to the vehicle's engine and engine cooling with 69 problems. The second most common problem is related to the vehicle's electrical system (14 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 2003 Infiniti I35 in the United States are 17,242 units [1]. If the total number of problems reported by Infiniti I35 owners in the last 19 years is 133, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 133 / 17,242 / 19 * 1000 = 0.41.
For more information, refer to this page: A study of reliability comparison across Infiniti I35 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2003 Infiniti I35 in 2003.
| Service Year | Number of Problems |
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When making the decision between buying a new or used Infiniti I35, the following table can be used to compare the 2003 Infiniti I35 with the Infiniti I35 from other model years. Note that the number of problems reported for the 2003 I35 is 133 while the average number of problems reported for the 4 model years of the Infiniti I35 is 72.