Porsche 718 cayman s s-a vs Porsche 911: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Porsche 718 cayman s s-a
97%
MOT pass rate · 168 vehicles
Porsche 911
85%
MOT pass rate · 74,656 vehicles
Verdict: On MOT pass rate the Porsche 718 cayman s s-a (97%) and Porsche 911 (85%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Porsche 718 cayman s s-a | Porsche 911 |
|---|---|---|
| MOT pass rate | 97% ✓ | 85% |
| MOT failure rate | 3% ✓ | 15% |
| Faults & advisories per test | 0.0 ✓ | 1.1 |
| Dangerous-fault share | — ✓ | 1% |
| Average mileage | 38,977 mi | 70,982 mi |
| Sample size (vehicles) | 168 | 74,656 |
Most common faults
Porsche 718 cayman s s-a
No fault breakdown available.
Porsche 911
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Under-trays fitted obscuring some underside components
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Oil leak, but not excessive (8.4.1 (a) (i))
Reliability FAQ
On MOT pass rate the Porsche 718 cayman s s-a (97%) and Porsche 911 (85%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Porsche 718 cayman s s-a report Full Porsche 911 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.