Mazda MX-5 vs Porsche 911
On MOT-testable defects the Porsche 911 comes out ahead: 9.7% of its tests record a failure against 18.7% for the Mazda MX-5, a 9.1-point gap. The biggest single difference is suspension, where the MX-5 records failures noticeably more often.
18.7%
MX-5 fail rate
9.7%
911 fail rate
9.07pp
Difference
Side by side
| Metric | Mazda MX-5 | Porsche 911 |
|---|---|---|
| MOT tests analysed | 557,938 | 252,686 |
| Pass rate | 81.3% | 90.3% |
| Fail rate | 18.7% | 9.7% |
Where they differ
| Category | MX-5 | 911 |
|---|---|---|
| Suspension | 8.1% | 1.6% |
| Brakes | 6.8% | 2.0% |
| Visibility | 3.5% | 0.0% |
| Tyres | 0.0% | 2.3% |
| Emissions & environmental | 4.1% | 1.9% |
| Lighting & signalling | 6.9% | 4.8% |
Methodology & source. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.