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Triumph Tr3a vs Triumph Unknown: reliability comparison

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

Triumph Tr3a
89%
MOT pass rate · 143 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Tr3a (89%) 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 Tr3a Triumph Unknown
MOT pass rate 89% 89%
MOT failure rate 11% 11%
Faults & advisories per test 0.6 0.6
Dangerous-fault share 1% ✓ 2%
Average mileage 38,826 mi 16,601 mi
Sample size (vehicles) 143 65,927

Most common faults

Triumph Tr3a

  1. Nearside Front wheel bearing has slight play (2.5.A.3c)
  2. Steering system has slight free play detected at steering wheel (2.2.A.1a)
  3. Oil leak
  4. Windscreen washer provides insufficient washer liquid (8.2.3)
  5. Offside Front wheel bearing has slight play (2.5.A.3c)
  6. Offside Rear wheel bearing has slight play (2.6.2)

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 Tr3a (89%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Tr3a 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.