Triumph Herald Convertable MOT Pass Rate
Overall pass rate across all manufacture years, based on 54 real MOT test results. Failure rate: 35.2%.
Data from official DVSA MOT testing records
Triumph Herald Convertable MOT Reliability Overview
The Triumph Herald Convertable is a rare vehicle in the UK, with 54 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 64.8% and a failure rate of 35.2%, which is around the UK average of approximately 37%.
Based on this data, the Triumph Herald Convertable earns a "Average" reliability rating. The average Triumph Herald Convertable presents for MOT with approximately 46,945 miles on the clock.
The most common MOT failure for the Triumph Herald Convertable is Brakes, affecting 37.0% of all tests. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. The second most common issue is Lamps, Reflectors and Electrical Equipment at 35.2%. Body, Structure and General Items rounds out the top three at 27.8%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Brakes | 44.4% | 24 |
| 2 | Lamps, Reflectors And Electrical Equipment | 40.7% | 22 |
| 3 | Body, Structure And General Items | 29.6% | 16 |
| 4 | Suspension | 24.1% | 13 |
| 5 | Driver's View Of The Road | 16.7% | 9 |
| 6 | Seat Belts And Supplementary Restraint Systems | 13.0% | 7 |
| 7 | Steering | 13.0% | 7 |
| 8 | Road Wheels | 7.4% | 4 |
| 9 | Items Not Tested | 1.9% | 1 |
| 10 | Tyres | 1.9% | 1 |
| 11 | Exhaust, Fuel And Emissions | 1.9% | 1 |
| 12 | Non-component Advisories | 1.9% | 1 |
Failures per 10,000 Miles
avg. 46,945 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Brakes | 9.47 | 44.4% | 24 |
| Lamps & Electrical | 8.68 | 40.7% | 22 |
| Body & Structure | 6.31 | 29.6% | 16 |
| Suspension | 5.13 | 24.1% | 13 |
| Visibility | 3.55 | 16.7% | 9 |
| Seat Belts | 2.76 | 13.0% | 7 |
| Steering | 2.76 | 13.0% | 7 |
| Wheels | 1.58 | 7.4% | 4 |
| Items Not Tested | 0.39 | 1.9% | 1 |
| Tyres | 0.39 | 1.9% | 1 |
| Emissions & Exhaust | 0.39 | 1.9% | 1 |
| Non-component advisories | 0.39 | 1.9% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Triumph Herald Convertable has 46,945 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The Triumph Herald Convertable has a mileage-adjusted failure rate of 7.50% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Triumph Herald Convertable MOT Data
The Triumph Herald Convertable is a rare vehicle in the UK, with 54 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 64.8% and a failure rate of 35.2%, which is around the UK average of approximately 37%.
For Triumph Herald Convertable owners, these results suggest average reliability — some preparation before MOT can improve pass chances. Focus your pre-MOT checks on brakes and lamps, reflectors and electrical equipment for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific Herald Convertable is likely to perform.
Brakes — 37.0% of failures
Brakes issues account for 37.0% of MOT failures on the Triumph Herald Convertable. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Lamps, Reflectors and Electrical Equipment — 35.2% of failures
Lamps, Reflectors and Electrical Equipment issues account for 35.2% of MOT failures on the Triumph Herald Convertable. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Body, Structure and General Items — 27.8% of failures
Body, Structure and General Items issues account for 27.8% of MOT failures on the Triumph Herald Convertable. Body and structure failures include excessive corrosion, sharp edges, loose panels, and damage to the vehicle frame. Rust is the primary concern, especially on older vehicles or those exposed to road salt. Typical repair costs: £100–500+. Pre-MOT check: Inspect sills, wheel arches, door bottoms, and the chassis for rust. Surface rust is acceptable but structural corrosion or holes will fail. Check that all doors, bonnet, and boot close securely.
Frequently Asked Questions
What is the MOT pass rate for the Triumph Herald Convertable?
Based on 54 (based on limited data) MOT tests in our database, the Triumph Herald Convertable has an overall pass rate of 64.8% (35.2% fail rate).
What are the most common MOT failures on a Triumph Herald Convertable?
The top 3 reasons a Triumph Herald Convertable fails its MOT are: 1. Brakes (37.0%), 2. Lamps, Reflectors and Electrical Equipment (35.2%), 3. Body, Structure and General Items (27.8%). Check these areas before booking your MOT.
Is the Triumph Herald Convertable reliable?
With a 35.2% MOT failure rate, the Herald Convertable is about average compared to the UK average of ~40%.
What should I check before an MOT on my Triumph Herald Convertable?
Based on failure data, focus on: Brakes (37.0%); Lamps, Reflectors and Electrical Equipment (35.2%); Body, Structure and General Items (27.8%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.