Porsche 911 vs Porsche Cayman: MOT reliability compared
Updated 05 September 2026.
11.2%
Porsche Cayman MOT failure rate, 3.4 pts lower than Porsche 911
Porsche Cayman is the more reliable MOT performer: 11.2% of Porsche Cayman MOTs fail versus 14.6% for Porsche 911, a 3.4 point gap.
| Metric | Porsche 911 | Porsche Cayman |
|---|---|---|
| MOT failure rate | 14.6% | 11.2% |
| Tests analysed | 1,015,318 | 188,582 |
| Most common failure | Lamps & electrical (32.2%) | Lamps & electrical (23.9%) |
Questions and answers
Which is more reliable, Porsche 911 or Porsche Cayman?
Porsche Cayman is the more reliable MOT performer: 11.2% of Porsche Cayman MOTs fail versus 14.6% for Porsche 911, a 3.4 point gap.
What is the MOT failure rate of the Porsche 911?
14.6% of Porsche 911 MOT tests result in a failure, from 1,015,318 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.