Triumph Stag Reliability, MOT Pass Rate & Common Faults
Free Triumph Stag car check
Is the Triumph Stag reliable? We analysed 64,590 real MOT tests across 6,070 vehicles to find out.
Got a specific Triumph Stag? Enter the reg for a free check:
The Triumph Stag is above average for reliability based on real UK MOT data. Common problems include windscreen washer provides insufficient washer liquid, parking brake: efficiency below requirements and suspension component mounting prescribed area is excessively corroded. Here's everything you need to know before buying a used Triumph Stag.
Triumph Stag Number Plates
Number plates registered to a Triumph Stag. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Triumph Stag MOT Pass Rate by Year
How likely is a Triumph Stag to pass its MOT? Here's the pass rate for each registration year, newest first.
Triumph Stag Problems — What Goes Wrong?
The most common reasons a Triumph Stag fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Triumph Stag Mileage — What's Normal?
How many miles does a typical Triumph Stag owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Triumph Stag MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Triumph Stag year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1995 | 56 | 71.4% | 26,292 | 54,176 | 56,625 |
| 1994 | 52 | 88.5% | 11,646 | 64,695 | 76,471 |
| 1990 | 70 | 78.6% | 36,378 | 45,668 | 51,370 |
| 1989 | 71 | 83.1% | 34,416 | 49,355 | 51,763 |
| 1988 | 74 | 79.7% | 12,315 | 19,100 | 51,152 |
| 1987 | 63 | 74.6% | 52,797 | 70,817 | 77,198 |
| 1984 | 69 | 82.6% | 47,899 | 80,204 | 86,132 |
| 1982 | 70 | 85.7% | 37,272 | 52,852 | 58,046 |
| 1981 | 162 | 74.1% | 44,530 | 58,997 | 80,586 |
| 1980 | 103 | 74.8% | 19,812 | 40,373 | 71,702 |
| 1979 | 171 | 81.3% | 17,730 | 39,638 | 60,759 |
| 1978 | 2,710 | 75.5% | 35,588 | 62,190 | 78,376 |
| 1977 | 6,546 | 77.7% | 34,062 | 60,708 | 78,760 |
| 1976 | 8,202 | 75.5% | 25,648 | 57,333 | 79,846 |
| 1975 | 5,791 | 76.4% | 20,099 | 54,677 | 77,278 |
| 1974 | 9,750 | 78.3% | 21,451 | 57,450 | 79,032 |
| 1973 | 10,065 | 77.9% | 20,918 | 53,671 | 79,696 |
| 1972 | 13,074 | 78.5% | 18,842 | 52,504 | 80,414 |
| 1971 | 5,896 | 77.2% | 20,098 | 56,944 | 80,134 |
| 1970 | 898 | 79.3% | 21,309 | 57,238 | 76,943 |
How Long Does a Triumph Stag Last?
Based on 6,070 Triumph Stag vehicles on UK roads.
Triumph Stag Mileage Distribution
Total mileage recorded across all Triumph Stag MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Triumph Stag
Based on MOT pass rates across all registration years with sufficient test data.
88.5% MOT pass rate from 52 tests
71.4% MOT pass rate from 56 tests
The best year to buy a used Triumph Stag is 1994, which has the highest MOT pass rate at 88.5% across 52 tests. The 1995 model year has the lowest pass rate at 71.4% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Triumph Stag Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Triumph Stag THIS CAR | 77.5% | 64,590 | 56,548 mi | 56 yrs |
| Triumph Bonneville | 90.1% | 235,206 | 7,823 mi | 53 yrs |
| Triumph Tiger | 90.6% | 196,853 | 17,026 mi | 32 yrs |
| Triumph Sprint | 87.3% | 158,613 | 21,242 mi | 33 yrs |
| Seat Cordoba | 66.1% | 99,964 | 84,360 mi | 32 yrs |
Compared to the Triumph Bonneville (90.1% pass rate) and the Triumph Tiger (90.6% pass rate), the Triumph Stag trails behind on MOT reliability.
Found a Triumph Stag you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Triumph StagShould you buy a used Triumph Stag?
The Triumph Stag has an overall MOT pass rate of 77.5% across 64,590 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Triumph Stag are windscreen washer provides insufficient washer liquid (2,039 recorded failures), parking brake: efficiency below requirements (1,744), and suspension component mounting prescribed area is excessively corroded (1,507). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Triumph Stag owner drives around 417 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Triumph Stag models stay on UK roads for around 56 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.