Ferrari F355 owners have reported a total of 5 problems for their cars built in the 2 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the Ferrari F355. The 1998 Ferrari F355 cars have the most problems reported (2 problems).
The following chart shows the 4 most common problems for Ferrari F355 cars. The number one most common problem is related to the vehicle's fuel system, gasoline (2 problems). The second most common problem is related to the vehicle's fuel system, other (1 problem).
| Problem Category | Number of Problems |
|---|---|
| Gasoline Fuel System | |
| Other Fuel System | |
| Equipment | |
| Steering |
It would not be fair to compare the Ferrari F355 of an older model year to newer model years since older vehicles have been in service longer and thus are expected to have more problems. In order to compare the reliability across F355 model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index indicates greater reliability of the given model year cars.
PPMY = P / S / Y * 1000,
where P = total problems reported during the life of a Ferrari F355 model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).
The results are shown in Table 3.