MOT reliability
Triumph 21
93 vehicles · 469 completed MOT tests analysed
94%
MOT pass rate
Based on 93 Triumph 21 vehicles and 469 completed MOT tests, the Triumph 21 has an overall 94% pass rate, with an average recorded mileage of 28,074 miles.
93
Vehicles
469
MOT tests
191
Avg miles / year
0.3
Faults per test
0%
Dangerous-fault share
Triumph 21 problem areas
Where faults occur most across all Triumph 21 MOT tests:
-
Other114%
-
Steering20%
-
Lamps & electrical5%
-
Brakes5%
-
Tyres, wheels & suspension1%
Triumph 21 pass rate by age
| Age (years) | Tests | Pass rate |
|---|---|---|
| 1 | 2 | 100% |
| 2 | 3 | 100% |
| 3 | 1 | 100% |
| 4 | 3 | 100% |
| 5 | 2 | 100% |
| 6 | 1 | 100% |
| 8 | 2 | 100% |
| 9 | 1 | 100% |
| 10 | 3 | 100% |
| 11 | 3 | 100% |
| 12 | 3 | 100% |
| 13 | 3 | 100% |
| 14 | 2 | 100% |
| 15 | 4 | 100% |
| 16 | 1 | 100% |
| 17 | 2 | 100% |
| 18 | 7 | 71% |
| 20 | 2 | 100% |
Fuel types: Petrol (92), Other (1)
Most common Triumph 21 MOT faults
These are the faults and advisories recorded most often across Triumph 21 MOT tests:
- Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d) (24 times)
- Rear suspension bush has slight free play (2.4.A2a(i)) (11 times)
- Steering headbearing has slight free play (2.2.2) (8 times)
- Rear Roller brake test indicates slight fluctuation of brake effort (3.3.A1d) (7 times)
- Oil leak (6 times)
- Wheel alignment slightly misaligned. (2.5.1) (5 times)
- Rear wheel bearings have slight free play (2.4.A.2c) (5 times)
- No lights fitted at time of test (5 times)
- Rear Wheel alignment slightly misaligned. (2.5.1) (4 times)
- Front wheel bearings are slightly rough (2.3.5b) (4 times)
- Front Wheel has a slightly eccentric bead rim. (4.2.2) (4 times)
- Front Roller brake test indicates a slightly juddering brake (3.3.A1b) (3 times)
- Headlamp aim too high (1.6) (3 times)
- Rear position lamp does not illuminate immediately when it is switched on (1.1.3a) (3 times)
- Stop lamp does not illuminate immediately a brake applies (1.3.1a) (3 times)
Triumph 21 pass rate by registration year
| Year | Vehicles | Tests | Pass rate | Avg mileage |
|---|---|---|---|---|
| 2015 | 1 | 1 | 100% | 2 |
| 2011 | 2 | 7 | 100% | 590 |
| 2008 | 1 | 5 | 100% | 44,165 |
| 2002 | 1 | 4 | 100% | 4,961 |
| 1999 | 1 | 2 | 50% | 8,737 |
| 1998 | 1 | 7 | 100% | 1,542 |
| 1997 | 1 | 6 | 100% | 3,134 |
| 1996 | 1 | 8 | 100% | 31,167 |
| 1991 | 1 | 3 | 100% | 2,994 |
| 1990 | 2 | 7 | 100% | 37,607 |
| 1988 | 2 | 9 | 78% | 32,072 |
| 1987 | 1 | 4 | 75% | 11,429 |
| 1984 | 3 | 22 | 95% | 30,724 |
| 1979 | 1 | 9 | 100% | 19,778 |
| 1970 | 1 | 1 | 100% | 26,199 |
| 1967 | 3 | 14 | 100% | 15,032 |
| 1966 | 4 | 16 | 100% | 16,234 |
| 1965 | 3 | 28 | 100% | 49,500 |
| 1964 | 3 | 23 | 91% | 21,017 |
| 1963 | 5 | 41 | 95% | 41,022 |
| 1962 | 12 | 78 | 90% | 65,902 |
| 1961 | 7 | 25 | 92% | 11,418 |
| 1960 | 12 | 77 | 92% | 39,205 |
| 1959 | 5 | 18 | 94% | 9,089 |
| 1958 | 11 | 37 | 97% | 15,696 |
| 1957 | 6 | 14 | 100% | 14,688 |
| 1934 | 1 | 1 | 100% | 20,575 |
Triumph 21 reliability FAQ
Across 93 Triumph 21 vehicles in our MOT data,
94% pass the MOT (a 6% failure rate), with about
0.3 faults or advisories recorded per test.
The most frequently recorded Triumph 21 MOT issues are:
Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d); Rear suspension bush has slight free play (2.4.A2a(i)); Steering headbearing has slight free play (2.2.2).
The typical Triumph 21 in our data has covered around
28,074 miles.
Compare the Triumph 21
See how the Triumph 21 stacks up against other Triumph models on MOT reliability:
Check a specific Triumph 21
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