Porsche Cayenne vs Porsche Speedster convertable: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Porsche Cayenne
84%
MOT pass rate · 40,483 vehicles
Porsche Speedster convertable
100%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Porsche Cayenne (84%) and Porsche Speedster convertable (100%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Porsche Cayenne | Porsche Speedster convertable |
|---|---|---|
| MOT pass rate | 84% | 100% ✓ |
| MOT failure rate | 16% | 0% ✓ |
| Faults & advisories per test | 1.2 | 0.0 ✓ |
| Dangerous-fault share | 3% | — ✓ |
| Average mileage | 87,610 mi | 46,985 mi |
| Sample size (vehicles) | 40,483 | 1 |
Most common faults
Porsche Cayenne
- Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Porsche Speedster convertable
No fault breakdown available.
Reliability FAQ
On MOT pass rate the Porsche Cayenne (84%) and Porsche Speedster convertable (100%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Porsche Cayenne report Full Porsche Speedster convertable report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.