Porsche Boxster vs Porsche Cayman: MOT reliability compared
Updated 05 September 2026.
11.2%
Porsche Cayman MOT failure rate, 6.0 pts lower than Porsche Boxster
Porsche Cayman is the more reliable MOT performer: 11.2% of Porsche Cayman MOTs fail versus 17.2% for Porsche Boxster, a 6.0 point gap.
| Metric | Porsche Boxster | Porsche Cayman |
|---|---|---|
| MOT failure rate | 17.2% | 11.2% |
| Tests analysed | 736,425 | 188,582 |
| Most common failure | Lamps & electrical (28.2%) | Lamps & electrical (23.9%) |
Questions and answers
Which is more reliable, Porsche Boxster or Porsche Cayman?
Porsche Cayman is the more reliable MOT performer: 11.2% of Porsche Cayman MOTs fail versus 17.2% for Porsche Boxster, a 6.0 point gap.
What is the MOT failure rate of the Porsche Boxster?
17.2% of Porsche Boxster MOT tests result in a failure, from 736,425 tests.
What is the MOT failure rate of the Porsche Cayman?
11.2% of Porsche Cayman MOT tests result in a failure, from 188,582 tests.