Triumph Stag
From 1,459 MOT tests. Above average for its class.
Common MOT failure categories
Pass rate by registration year
What goes wrong?
The most common MOT failure reasons are windscreen washers not working or not providing sufficient fluid to clear the windscreen, a suspension pin, bush or joint excessively worn, the strength or continuity of the load bearing structure within 30cm of any sub-frame and spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired. The top issue, windscreen washers not working or not providing sufficient fluid to clear the windscreen, caused 43 failures in 2024. If you need repairs before retesting, sites like BookMyGarage let you compare local prices.
| windscreen washers not working or not providing sufficient fluid to clear the windscreen | 43 |
| a suspension pin, bush or joint excessively worn | 29 |
| the strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired | 29 |
| brakes imbalance across an axle such that the braking effort from any wheel is less than 70% of the maximum effort recorded from the other wheel on the same axle. | 26 |
| body, cab or chassis excessively corroded at a mounting point | 26 |
| emissions levels exceed default limits | 25 |
| the aim of a headlamp is not within limits laid down in the requirements | 24 |
| a headlamp or light source missing, inoperative or more than ½ not functioning in the case of led | 23 |
| significant brake effort recorded with no brake applied indicating a binding brake | 21 |
| a direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning | 21 |
How serious are these failures?
Not all MOT failures are equal. 39.3% of failures are serious: 28.5% are safety issues (brakes, steering, tyre damage) and 10.9% could actually leave you stranded. That's close to the 44.4% average across all models. When it does fail, the average repair bill is around £104.
By registration year
| Year | Pass rate | Top failures |
|---|---|---|
| 1977 | 83.5% | emissions levels exceed default limits, a transmission shaft constant velocity joint boot severely deteriorated |
| 1976 | 82.9% | emissions levels exceed default limits, vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced |
| 1975 | 82.9% | a suspension pin, bush or joint excessively worn, vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced |
| 1974 | 81.7% | windscreen washers not working or not providing sufficient fluid to clear the windscreen, brakes imbalance across an axle such that the braking effort from any wheel is less than 70% of the maximum effort recorded from the other wheel on the same axle. |
3 earlier years
| 1973 | 85.7% | a suspension joint dust cover missing or no longer prevents the ingress of dirt etc, a suspension pin, bush or joint excessively worn |
| 1972 | 79.7% | windscreen washers not working or not providing sufficient fluid to clear the windscreen, a battery insecure and likely to fall from carrier or cause a short circuit |
| 1971 | 86.9% | steering rack gaiter or ball joint dust cover damaged or deteriorated, windscreen washers not working or not providing sufficient fluid to clear the windscreen |
Typical mileage
Half of all Stags tested had between 21,739 and 81,104 miles on the clock.
At 54,176 median miles, the Stag has 0.033 failures per 10,000 miles driven.
Other Triumph models
| Triumph Bonneville | 90.9% |
| Triumph Tiger | 91.6% |
| Triumph Sprint | 87.1% |
| Triumph Daytona | 85.9% |
| Triumph Speed Triple | 88.7% |
Common questions
What is the Triumph Stag MOT pass rate?
The Triumph Stag has a 82% MOT pass rate based on 1,459 real MOT tests. This is above the national average.
What are common MOT failures on a Triumph Stag?
The most common MOT failure on the Triumph Stag is windscreen washers not working or not providing sufficient fluid to clear the windscreen, which caused 43 failures. Other common issues include a suspension pin, bush or joint excessively worn.
What is the typical mileage of a Triumph Stag at MOT?
The median mileage at MOT for a Triumph Stag is 54,176 miles. The middle 50% of vehicles tested have between 21,739 and 81,104 miles.
Buying a used Stag?
Start with the free tools. Look up the specific vehicle's MOT history on GOV.UK The mileage at each test will show if it's been wound back, and the advisory history tells you what's wearing. Cross-reference that against the typical failures above to see if anything looks unusual for this model.
The free data won't tell you about outstanding finance, theft markers, or write-off history. For that, you need a vehicle history check This is especially important on a private sale where you have fewer legal protections.
With a 82% pass rate and an average repair bill of £104 when things go wrong, budget accordingly.
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MOT data from DVSA anonymised test results, 2024 test year. Fleet data from DfT vehicle licensing statistics. Crown copyright, OGL v3.0. MOT pass rates are statistical summaries of test outcomes, not assessments of individual vehicle safety or condition. Always inspect a vehicle and check its full MOT history before purchasing. See terms of use.