Triumph 1500 vs Triumph Tr 4 a: 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 Tr 4 a
67%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Triumph 1500 (74%) and Triumph Tr 4 a (67%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Triumph 1500 | Triumph Tr 4 a |
|---|---|---|
| MOT pass rate | 74% ✓ | 67% |
| MOT failure rate | 26% ✓ | 33% |
| Faults & advisories per test | 2.3 | 1.3 ✓ |
| Dangerous-fault share | 0% | 0% |
| Average mileage | 58,068 mi | 24,558 mi |
| Sample size (vehicles) | 37,142 | 1 |
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 Tr 4 a
- Nearside Front wheel bearing has excessive play (2.5.A.3c)
- Offside Front wheel bearing has excessive play (2.5.A.3c)
- Offside Headlamp excessively deteriorated so that the light output is severely reduced (1.7.5a)
- Registration plate lamp not fitted (1.1.C.1b)
- Track rod end loose (2.2.B.1d)
- Nearside rear parking brake recording little or no effort (3.7.B.6a)
Reliability FAQ
On MOT pass rate the Triumph 1500 (74%) and Triumph Tr 4 a (67%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Triumph 1500 report Full Triumph Tr 4 a 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.