Triumph 1500 vs Triumph Stag auto: 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 Stag auto
77%
MOT pass rate · 4,679 vehicles
More reliable
Verdict: On MOT pass rate, the Triumph Stag auto is the more reliable of the two — 77% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Triumph 1500 | Triumph Stag auto |
|---|---|---|
| MOT pass rate | 74% | 77% ✓ |
| MOT failure rate | 26% | 23% ✓ |
| Faults & advisories per test | 2.3 | 1.7 ✓ |
| Dangerous-fault share | 0% | 0% |
| Average mileage | 58,068 mi | 63,977 mi |
| Sample size (vehicles) | 37,142 | 4,679 |
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 Stag auto
- Oil leak
- Parking brake: efficiency below requirements (3.7.B.7)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Exhaust emissions carbon monoxide content excessive (7.3.B.1a)
- Nearside Front wheel bearing has slight play (2.5.A.3c)
- Oil leak, but not excessive (8.4.1 (a) (i))
Reliability FAQ
On MOT pass rate, the Triumph Stag auto is the more reliable of the two — 77% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Full Triumph 1500 report Full Triumph Stag auto 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.