Triumph Unknown vs Triumph Xo: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Triumph Xo
100%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Triumph Unknown (89%) and Triumph Xo (100%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Triumph Unknown | Triumph Xo |
|---|---|---|
| MOT pass rate | 89% | 100% ✓ |
| MOT failure rate | 11% | 0% ✓ |
| Faults & advisories per test | 0.6 | 0.3 ✓ |
| Dangerous-fault share | 2% | 0% ✓ |
| Average mileage | 16,601 mi | — |
| Sample size (vehicles) | 65,927 | 2 |
Most common faults
Triumph Unknown
- Exhaust noisy (8.1.1 (a))
- Exhaust noisy (7.1.2)
- Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
- COVID-19 6 MONTH EXTENSION
- Rear Tyre worn close to the legal limit (5.2.3 (e))
- Steering headbearing has slight free play (2.2.2)
Triumph Xo
- Roller brake test Higher brake efficiency normally obtainable. (3.3.A2a)
Reliability FAQ
On MOT pass rate the Triumph Unknown (89%) and Triumph Xo (100%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Triumph Unknown report Full Triumph Xo 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.