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Triumph Monaco vs Triumph Unknown: reliability comparison

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

Triumph Monaco
73%
MOT pass rate · 1 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Monaco (73%) 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 Monaco Triumph Unknown
MOT pass rate 73% 89% ✓
MOT failure rate 27% 11% ✓
Faults & advisories per test 0.7 0.6 ✓
Dangerous-fault share 0% ✓ 2%
Average mileage 99,174 mi 16,601 mi
Sample size (vehicles) 1 65,927

Most common faults

Triumph Monaco

  1. Nearside Steering rack gaiter deteriorated (2.2.D.2d)
  2. Offside Steering rack gaiter deteriorated (2.2.D.2d)
  3. near side front and off side front tyre's splitting on side walls
  4. Offside Front wheel bearing has slight play (2.5.A.3c)
  5. Offside Front Direction indicators not working (1.4.A.2c)
  6. Rear Stop lamp remains on when the brakes are released (1.2.1e)

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 Monaco (73%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Monaco 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.