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Triumph Mk2 vs Triumph Unknown: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Triumph Mk2
90%
MOT pass rate · 2 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Mk2 (90%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Triumph Mk2 Triumph Unknown
MOT pass rate 90% ✓ 89%
MOT failure rate 10% ✓ 11%
Faults & advisories per test 0.6 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 34,335 mi 16,601 mi
Sample size (vehicles) 2 65,927

Most common faults

Triumph Mk2

  1. Horn not working (1.6.2a)
  2. Inner Rear reflector missing (1.5.1a)
  3. Nearside Headlamp not working on main beam (1.7.5a)
  4. Nearside Rear Anti-roll bar linkage modified and seriously weakened (2.4.A.2)
  5. Nearside Rear Body or chassis has an inadequate repair, seriously affecting its strength within 30cm of the body mountings (6.1.B.2)
  6. Offside Front Brake hose twisted (found during steering lock to lock check) (2.2.D.2b)

Triumph Unknown

  1. Exhaust noisy (8.1.1 (a))
  2. Exhaust noisy (7.1.2)
  3. Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
  4. COVID-19 6 MONTH EXTENSION
  5. Rear Tyre worn close to the legal limit (5.2.3 (e))
  6. Steering headbearing has slight free play (2.2.2)

Reliability FAQ

On MOT pass rate the Triumph Mk2 (90%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Mk2 report Full Triumph Unknown 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.