Mazda Mx-5 + vs Porsche Boxster
On MOT-testable defects, the Porsche Boxster (fail rate 13.8%) performed better than the Mazda Mx-5 + (18.9%) across comparable years. The biggest divergence was suspension, where the Mx-5 + recorded failures more often.
18.9%
Mx-5 + fail rate
13.8%
Boxster fail rate
5.04pp
Difference
Side by side
| Metric | Mazda Mx-5 + | Porsche Boxster |
|---|---|---|
| MOT tests analysed | 551,879 | 182,460 |
| Pass rate | 81.1% | 86.2% |
| Fail rate | 18.9% | 13.8% |
Where they differ
| Category | Mx-5 + | Boxster |
|---|---|---|
| Suspension | 8.1% | 3.8% |
| Visibility | 3.5% | 0.0% |
| Brakes | 6.9% | 3.6% |
| Tyres | 0.0% | 2.7% |
| Lighting & signalling | 6.9% | 6.1% |
| Emissions & environmental | 4.2% | 3.9% |
Methodology & source. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.