Porsche 991 vs Porsche Boxster: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Porsche 991
100%
MOT pass rate · 1 vehicles
Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
Verdict: On MOT pass rate the Porsche 991 (100%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Porsche 991 | Porsche Boxster |
|---|---|---|
| MOT pass rate | 100% ✓ | 83% |
| MOT failure rate | 0% ✓ | 17% |
| Faults & advisories per test | 0.0 ✓ | 1.4 |
| Dangerous-fault share | — ✓ | 1% |
| Average mileage | 20,037 mi | 74,547 mi |
| Sample size (vehicles) | 1 | 46,488 |
Most common faults
Porsche 991
No fault breakdown available.
Porsche Boxster
- 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)
- Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Porsche 991 (100%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Porsche 991 report Full Porsche Boxster 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.