Triumph 1500 vs Triumph T20s: 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 T20s
85%
MOT pass rate · 5 vehicles
Verdict: On MOT pass rate the Triumph 1500 (74%) and Triumph T20s (85%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Triumph 1500 | Triumph T20s |
|---|---|---|
| MOT pass rate | 74% | 85% ✓ |
| MOT failure rate | 26% | 15% ✓ |
| Faults & advisories per test | 2.3 | 0.4 ✓ |
| Dangerous-fault share | 0% | 0% |
| Average mileage | 58,068 mi | 441 mi |
| Sample size (vehicles) | 37,142 | 5 |
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 T20s
- Steering movement slightly stiff (2.2.1b)
- Front Roller brake test indicates a slightly juddering brake (3.3.A1b)
- Rear wheel bearings have slight free play (2.4.A.2c)
- Stop lamp does not illuminate immediately a brake applies (1.3.1a)
- Front wheel bearings are excessively rough (2.3.5b)
- Roller brake test The less effective brake control does not achieve an efficiency of 25%. (3.3.A2b)
Reliability FAQ
On MOT pass rate the Triumph 1500 (74%) and Triumph T20s (85%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Triumph 1500 report Full Triumph T20s 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.