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Triumph Stag Auto MOT Check

MOT pass rates, common failures, and reliability data for the Triumph Stag Auto. Check any Stag Auto by registration number below.

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86.2%

Avg Pass Rate

-4.3%

vs Triumph Avg

8

Year Ranges

Excellent

Reliability

Triumph Stag Auto — MOT Reliability Overview

The Triumph Stag Auto has an average MOT pass rate of 86.2%, which is 4.3 percentage points below the Triumph brand average of 90.4%. This is a strong result, indicating that the Stag Auto is well-engineered and tends to age well mechanically. Owners can expect fewer surprises at MOT time.

The most common reasons a Triumph Stag Auto fails its MOT are the aim of a headlamp is not within limits laid down in the requirements. If you are preparing your Stag Auto for its MOT, checking these areas first could save you a retest fee. Our detailed fault analysis includes estimated repair costs for each failure type.

Before buying a used Triumph Stag Auto, we recommend checking the full MOT history, write-off status, outstanding finance, and stolen vehicle status. These checks can be done for free using the registration number.

MOT Pass Rate by Year

How the Triumph Stag Auto performs at MOT across different model years.

1978

Based on 79 vehicles

87.3%Excellent
Triumph average: 90.4%
Dangerous Defects

2.0%

Retest Rate

18.4%

1977

Based on 108 vehicles

85.2%Excellent
Triumph average: 90.4%
Dangerous Defects

0.0%

Retest Rate

8.1%

1976

Based on 207 vehicles

82.1%Good
Triumph average: 90.4%
Dangerous Defects

2.0%

Retest Rate

12.8%

1975

Based on 100 vehicles

92.0%Excellent
Triumph average: 90.4%
Dangerous Defects

0.0%

Retest Rate

1.6%

1974

Based on 100 vehicles

80.0%Good
Triumph average: 90.4%
Dangerous Defects

7.3%

Retest Rate

14.5%

1973

Based on 148 vehicles

84.5%Good
Triumph average: 90.4%
Dangerous Defects

3.5%

Retest Rate

17.6%

1972

Based on 45 vehicles

93.3%Excellent
Triumph average: 90.4%
Dangerous Defects

0.0%

0

Based on 349 vehicles

85.1%Excellent
Triumph average: 90.4%
Mileage at 5yr

53k mi

Top MOT Failures — Triumph Stag Auto

The most common reasons a Triumph Stag Auto fails its MOT, aggregated across all year ranges.

1

The aim of a headlamp is not within limits laid down in the requirements

4.8%
Triumph Stag Auto Common Faults & Repair Costs

Where Failures Occur

The areas of the vehicle most commonly flagged during MOT inspections.

Front

6.3%

Nearside

6.3%

Rear

3.8%

Other Triumph Models

Compare MOT reliability across Triumph models.

Triumph TR7

100.0% pass rate

Triumph Dolomite

91.7% pass rate

Triumph GT6

95.5% pass rate

Triumph Bonneville T100 Bud Ekins

100.0% pass rate

Triumph Trophy 3

100.0% pass rate

Triumph Sprint Rs

84.4% pass rate

Useful MOT Guides

Common MOT Failures

The most common reasons UK vehicles fail their MOT — and how to prepare.

MOT Checklist

Pre-MOT checklist to improve your chances of passing first time.

Advisory vs Failure

Understanding the difference between MOT advisories and failures.

See detailed fault analysis for Triumph Stag Auto

Triumph Stag Auto — Frequently Asked Questions

Common questions about the Triumph Stag Auto MOT and reliability.

What is the MOT pass rate for the Triumph Stag Auto?
The average MOT pass rate for the Triumph Stag Auto is 86.2% compared to the Triumph average of 90.4%. Pass rates vary by year — check the year-by-year breakdown on this page for details.
What are the most common MOT failures on a Triumph Stag Auto?
The most common MOT failures on the Triumph Stag Auto are: The aim of a headlamp is not within limits laid down in the requirements (4.8%). These are the components most likely to cause an MOT failure.
Is the Triumph Stag Auto reliable?
With an average MOT pass rate of 86.2%, the Triumph Stag Auto is rated as "Excellent" for reliability. This is a strong result suggesting good build quality and fewer common defects.
How do I check the MOT history of a Triumph Stag Auto?
Enter the vehicle's registration number in the search box at the top of this page. You will instantly see the complete MOT history including every test result, mileage readings, advisories, and dangerous defects — completely free.
What mileage should I expect on a Triumph Stag Auto?
Typical mileage for the Triumph Stag Auto: 53,116 miles at 5 years. Use these benchmarks when evaluating a used Stag Auto to spot vehicles with unusually high or low mileage.

Check Your Triumph Stag Auto's MOT History

Enter the registration number for the full MOT history — free and instant.

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