Triumph Stag: MOT pass rate and reliability data
The Triumph Stag passes its MOT first time more often than the average UK car, by 6.6 percentage points. These figures come from the DVSA's full year of anonymised MOT results, covering 960 individual Triumph Stag tests. Nothing here is an estimate or a survey.
The numbers
| First-time pass rate | 83.3% |
| UK national average | 76.7% |
| Difference | +6.6 points |
| Tests analysed | 960 |
| Average mileage at test | 51,476 miles |
| Average year of manufacture | 1975 |
| Reliability rank | 1,328 of 2,005 models |
What this means if you are buying one
A 83.3% first-time pass rate means roughly 17 in every 100 Triumph Stags presented for MOT fail on the first attempt. That is better than average, so a well-kept example is a reasonably safe used buy. The average Triumph Stag tested had covered 51,476 miles and was built around 1975.
What this means at salvage auction
Pass rate is a proxy for what a car costs to keep on the road. On a Triumph Stag bought as a repairable salvage, the mechanical side is less likely to spring surprises, so your repair estimate should hold up reasonably well.
Before you bid: run the lot through the analyzer, check the car's own record, check the mileage, decode the VIN, and if it carries a marker use the write-off value calculator. Or compare it against another model.
Looking at a specific Triumph Stag rather than the model in general? The free check covers its MOT and mileage history, and the full HPI report confirms the insurance write-off category, outstanding finance and whether it is recorded stolen, from licensed data for 5 credits. Already own one that has been damaged? Work out whether fixing it beats selling it with the repair or scrap calculator, and see what damaged Triumph Stags actually sold for at UK salvage auction.
Most common MOT failures on a Triumph Stag
- Stop lamps all missing or inoperative, 1.1% of tests (18.24x the national rate for this defect)
- Body, cab or chassis excessively corroded at a mounting point, 1.9% of tests (9.26x the national rate for this defect)
- Emissions levels exceed default limits, 1.9% of tests (6.36x the national rate for this defect)
- 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., 2.1% of tests (5.21x the national rate for this defect)
- Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 1.5% of tests (4.13x the national rate for this defect)
- A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 1.6% of tests (3.22x the national rate for this defect)
- 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, 2.1% of tests (2.58x the national rate for this defect)
- Steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, 1.4% of tests (2.58x the national rate for this defect)
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 3.1% of tests (2.49x the national rate for this defect)
- Significant brake effort recorded with no brake applied indicating a binding brake, 1.7% of tests (2.24x the national rate for this defect)
From 1,400 DVSA-tracked Triumph Stag tests, 2024. DVSA testers marked 2.7% of these flagged Triumph Stag defects as "dangerous", meaning the tester judged the car unsafe to drive away, against 4.97% nationally.
Other Triumph models
- Triumph Tr6 - 87%
Models with a similar pass rate
- Ford Transit Custom - 83.3%
- BMW X5 Xdrive45e M Sport Auto - 83.3%
- BMW 4 Series - 83.3%
- Audi Q7 - 83.2%
- Ford Transit Custom 280leader Eblue - 83.2%
- Vauxhall Corsa E Se Nav - 83.2%
If this car is a salvage or write-off
- What does Cat N mean? Category N explained
- What does Cat S mean? Category S explained
- Cat S vs Cat N: the real differences
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