Triumph 1500 vs Triumph T509: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Triumph 1500
74%
MOT pass rate · 37,142 vehicles
Triumph T509
84%
MOT pass rate · 18 vehicles
More reliable
Verdict: On MOT pass rate, the Triumph T509 is the more reliable of the two — 84% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Triumph 1500 | Triumph T509 |
|---|---|---|
| MOT pass rate | 74% | 84% ✓ |
| MOT failure rate | 26% | 16% ✓ |
| Faults & advisories per test | 2.3 | 0.8 ✓ |
| Dangerous-fault share | 0% | 0% |
| Average mileage | 58,068 mi | 27,784 mi |
| Sample size (vehicles) | 37,142 | 18 |
Most common faults
Triumph 1500
- Parking brake: efficiency below requirements (3.7.B.7)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Nearside Rear wheel bearing has slight play (2.6.2)
- Offside Rear wheel bearing has slight play (2.6.2)
- Brakes imbalanced across an axle (3.7.B.5b)
- Oil leak
Triumph T509
- Exhaust noisy (7.1.2)
- Rear Tyre worn close to the legal limit (4.1.3(ii))
- Rear Brake disc(s) slightly worn (3.2.A1l)
- Drive chain slightly loose (6.2.1d)
- Rear Brake pedal is bent but brake can still be readily applied (3.1.3c)
- Front Tyre worn close to the legal limit (4.1.3(ii))
Reliability FAQ
On MOT pass rate, the Triumph T509 is the more reliable of the two — 84% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Full Triumph 1500 report Full Triumph T509 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.