# Riley 15 MOT reliability: pass rate and common failures | RegFlags

The Riley 15 passed its MOT first time 86% of the time, but from only 21 MOT tests, so treat it as a rough guide. See pass rates by year, common failures and typical mileage.

- First-time MOT pass rate: 86%
- MOT tests analysed: 21 (DVSA anonymised MOT data, 2025)
- Most common failure area: Brakes
- Licensed in Great Britain: 803 (2026 Q2)

These figures come from 21 MOT tests. That's a fairly small number of cars, so they may not be typical of these cars as a whole.

## By year of first use and fuel

| Year | Fuel | MOT tests | First-time pass rate |
| --- | --- | --- | --- |
| 1964 | Petrol | 4 (very few mots) | 100% |
| 1963 | Petrol | 3 (very few mots) | 100% |
| 1962 | Petrol | 5 (very few mots) | 100% |
| 1961 | Petrol | 5 (very few mots) | 100% |
| 1960 | Petrol | 4 (very few mots) | 25% |

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Canonical page: https://regflags.co.uk/reliability/riley/15
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