Skip to content

Triumph P1 vs Triumph Unknown: reliability comparison

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

Triumph P1
69%
MOT pass rate · 2 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph P1 (69%) 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 P1 Triumph Unknown
MOT pass rate 69% 89% ✓
MOT failure rate 31% 11% ✓
Faults & advisories per test 1.5 0.6 ✓
Dangerous-fault share 0% ✓ 2%
Average mileage 94,281 mi 16,601 mi
Sample size (vehicles) 2 65,927

Most common faults

Triumph P1

  1. Nearside Rear Body has slight corrosion (6.1.B.2)
  2. Offside Rear Body has slight corrosion (6.1.B.2)
  3. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Front Steering rack gaiter split (2.2.D.2d)
  5. Nearside Rear Stop lamp not working (1.2.1b)
  6. Offside Front Steering rack gaiter split (2.2.D.2d)

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 P1 (69%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph P1 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.