Triumph Stag MOT Check

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

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83.4%

Avg Pass Rate

-7.0%

vs Triumph Avg

Year Ranges

Good

Reliability

Triumph Stag — MOT Reliability Overview

The Triumph Stag has an average MOT pass rate of 83.4%, which is 7.0 percentage points below the Triumph brand average of 90.4%. This is a strong result, indicating that the Stag is well-engineered and tends to age well mechanically. Owners can expect fewer surprises at MOT time.

The most common reasons a Triumph Stag fails its MOT are emissions levels exceed default limits. If you are preparing your Stag 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, 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 performs at MOT across different model years.

1978

Based on 95 vehicles

82.1%Good

Triumph average: 90.4%

Dangerous Defects

1.9%

Retest Rate

11.1%

1977

Based on 267 vehicles

82.4%Good

Triumph average: 90.4%

Dangerous Defects

2.5%

Retest Rate

15.5%

1976

Based on 318 vehicles

82.4%Good

Triumph average: 90.4%

Dangerous Defects

2.7%

Retest Rate

15.0%

1975

Based on 199 vehicles

83.9%Good

Triumph average: 90.4%

Dangerous Defects

0.9%

Retest Rate

10.6%

1974

Based on 382 vehicles

85.6%Excellent

Triumph average: 90.4%

Dangerous Defects

1.4%

Retest Rate

11.3%

1973

Based on 375 vehicles

83.5%Good

Triumph average: 90.4%

Dangerous Defects

1.8%

Retest Rate

12.2%

1972

Based on 426 vehicles

83.1%Good

Triumph average: 90.4%

Dangerous Defects

3.3%

Retest Rate

15.9%

0

Based on 1,126 vehicles

84.3%Good

Triumph average: 90.4%

Mileage at 5yr

53k mi

Top MOT Failures — Triumph Stag

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

Emissions levels exceed default limits

3.5%

Triumph Stag Common Faults & Repair Costs

Where Failures Occur

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

Rear Nearside

5.3%

Nearside

4.2%

Offside

3.2%

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

Triumph Stag — Frequently Asked Questions

Common questions about the Triumph Stag MOT and reliability.

What is the MOT pass rate for the Triumph Stag?

The average MOT pass rate for the Triumph Stag is 83.4% 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?

The most common MOT failures on the Triumph Stag are: Emissions levels exceed default limits (3.5%). These are the components most likely to cause an MOT failure.

Is the Triumph Stag reliable?

With an average MOT pass rate of 83.4%, the Triumph Stag is rated as "Good" 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?

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?

Typical mileage for the Triumph Stag: 52,925 miles at 5 years. Use these benchmarks when evaluating a used Stag to spot vehicles with unusually high or low mileage.

Check Your Triumph Stag's MOT History

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