DVSA Statistics
1971 Triumph Stag
MOT Pass Rate & Pre-MOT Checklist
Used 1971 Triumph Stags usually pass their MOT, but around 1 in 5 still fail, most often for windscreen washers not working or not providing sufficient fluid to clear the windscreen, a tyre seriously damaged and the aim of a headlamp is not within limits laid down in the requirements. Based on 100 MOT tests from DVSA data, this page shows how this model performs and what to check before your test.
Pass Rate
Based on 100 DVSA anonymised MOT tests · About this data
Pass Rate
79%
About average
Top Failure Reasons
Common MOT failures for this model
Quick DIY Fix
Windscreen wipers are easy to replace yourself.
Based on DVSA statistics from 100 recorded tests.
Pre-MOT Checklist for 1971 Triumph Stag
Based on common failure points for this model, check these items before your MOT:
- 1
Check windscreen for chips or cracks in the driver view zone (Zone A)
Visibility – Common fail on this model
- 2
Check tyre tread depth is at least 1.6mm across the central 3/4 of the tyre
Tyres – Common fail on this model
- 3
Test all headlights work and aim is correct - check for condensation inside
Lighting – Common fail on this model
How Does This Compare to Other Years?
Previous Year
1970 Triumph Stag
Based on 14 UK MOT tests
Next Year
1972 Triumph Stag
Based on 185 UK MOT tests
The 1971 model shows improvement over 1970 but the 1972 model has an even better pass rate.
Why Trust This Data?
Official UK Government Source
This data comes from the UK's Driver and Vehicle Standards Agency (DVSA), the official body responsible for MOT testing standards. The anonymised MOT test data is published via data.gov.uk.
Understanding the Statistics
This page is based on 100 MOT tests from the 2023 DVSA dataset. Your 1971 Triumph Stag was 52 years old when this data was collected and is now 55 years old.
Sample Size
Moderate confidence - 100 tests (interpret with caution)
Limitations
Statistics reflect average outcomes and don't account for maintenance history, mileage, or regional variations. Individual results will vary based on how well a vehicle has been maintained.
Do you own this car?
Check your specific vehicle for outstanding advisories or recalls. Get a personalized risk report for your exact Triumph Stag.
Frequently Asked Questions
Is a 1971 Triumph Stag likely to fail its MOT?
Based on DVSA statistics, the 1971 Triumph Stag has a 79% MOT pass rate. This is above average, indicating good reliability for a vehicle of this age.
What are the most common MOT failures on a 1971 Triumph Stag?
The most common MOT failure reasons for a 1971 Triumph Stag are: windscreen washers not working or not providing sufficient fluid to clear the windscreen, a tyre seriously damaged, the aim of a headlamp is not within limits laid down in the requirements. Many of these can be checked and fixed before your test to improve your chances of passing.
How can I reduce the chance my 1971 Triumph Stag fails its MOT?
To improve your chances of passing, check the items that commonly fail on this model: windscreen washers not working or not providing sufficient fluid to clear the windscreen, a tyre seriously damaged, the aim of a headlamp is not within limits laid down in the requirements. Use our pre-MOT checklist above to identify potential issues before your test. Many common failures are easy DIY fixes.
How many 1971 Triumph Stags fail their MOT?
Around 21% of 1971 Triumph Stags fail their MOT test, meaning roughly 1 in 5 don't pass first time. The most common reasons are windscreen washers not working or not providing sufficient fluid to clear the windscreen and a tyre seriously damaged. Pre-checking these items can significantly improve your chances.
What should I check before my 1971 Triumph Stag MOT?
Before your 1971 Triumph Stag MOT, check these commonly-failed items: windscreen washers not working or not providing sufficient fluid to clear the windscreen, a tyre seriously damaged, the aim of a headlamp is not within limits laid down in the requirements. Most are visual checks you can do at home – look for worn tyres, test all lights work, and check for obvious damage or leaks.
Is the 1971 Triumph Stag reliable for MOT?
With a 79% MOT pass rate, the 1971 Triumph Stag performs above average compared to typical vehicles. This suggests good overall condition for a vehicle of this age.