Triumph Stag Auto
From 453 MOT tests. Above average for its class.
Common MOT failure categories
What goes wrong?
The most common MOT failure reasons are the aim of a headlamp is not within limits laid down in the requirements, parking brake efficiency below minimum requirement and windscreen washers not working or not providing sufficient fluid to clear the windscreen. The top issue, the aim of a headlamp is not within limits laid down in the requirements, caused 14 failures in 2024. If you need repairs before retesting, sites like BookMyGarage let you compare local prices.
| the aim of a headlamp is not within limits laid down in the requirements | 14 |
| parking brake efficiency below minimum requirement | 12 |
| windscreen washers not working or not providing sufficient fluid to clear the windscreen | 10 |
| significant brake effort recorded with no brake applied indicating a binding brake | 9 |
| 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. | 9 |
| a headlamp or light source missing, inoperative or more than ½ not functioning in the case of led | 9 |
| stop lamps all missing or inoperative | 7 |
| a suspension pin, bush or joint excessively worn | 7 |
| steering rack gaiter or ball joint dust cover damaged or deteriorated | 6 |
| a direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning | 6 |
How serious are these failures?
Not all MOT failures are equal. 41.6% of failures are serious: 41.6% are safety issues (brakes, steering, tyre damage) and 0% 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 £87.
By registration year
| Year | Pass rate | Top failures |
|---|---|---|
| 1976 | 81.8% | the aim of a headlamp is not within limits laid down in the requirements, a headlamp or light source missing, inoperative or more than ½ not functioning in the case of led |
Typical mileage
Half of all Stag Autos tested had between 37,268 and 76,140 miles on the clock.
At 63,925 median miles, the Stag Auto has 0.025 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 Auto MOT pass rate?
The Triumph Stag Auto has a 84.3% MOT pass rate based on 453 real MOT tests. This is above the national average.
What are common MOT failures on a Triumph Stag Auto?
The most common MOT failure on the Triumph Stag Auto is the aim of a headlamp is not within limits laid down in the requirements, which caused 14 failures. Other common issues include parking brake efficiency below minimum requirement.
What is the typical mileage of a Triumph Stag Auto at MOT?
The median mileage at MOT for a Triumph Stag Auto is 63,925 miles. The middle 50% of vehicles tested have between 37,268 and 76,140 miles.
Buying a used Stag Auto?
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 84.3% pass rate and an average repair bill of £87 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.