Lotus Exige - Problems, Statistics, and Analysis

Lotus Exige owners have reported a total of 10 problems for their cars built in the 3 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 Lotus Exige. The 2007 Lotus Exige cars have the most problems reported (8 problems).

Table 1. Total number of problems by model year for Lotus Exige

Model Year Number of Problems
  2008 Exige
1
  2007 Exige
8
  2006 Exige
1

  Common problems of Lotus Exige

The following chart shows the 3 most common problems for Lotus Exige cars. The number one most common problem is related to the vehicle's engine and engine cooling (6 problems). The second most common problem is related to the vehicle's visibility (2 problems).

Table 2. Common problems of Lotus Exige

Problem Category Number of Problems
  Engine And Engine Cooling
6
  Visibility
2
  Power Train
2

  Compare Reliability Across Model Years Using PPMY Index

It would not be fair to compare the Lotus Exige 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 Exige 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 Lotus Exige 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.

Table 3. Use PPMY Index to Compare Reliability Across Exige Model Years

Exige
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2006 134012    
0.25


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