1984 Austin Mini 25 — MOT failures & pass rate
Across 381 MOT tests, the 1984 Austin Mini 25 recorded a 77.7% pass rate. Against all cars of a similar age (19.7% fail rate), the 1984 Mini 25 comes out 2.6pp worse. Failures cluster in lighting & signalling, suspension and emissions & environmental.
What the MOT record shows
Lighting & signalling dominates the failure mix at 12.1% of all tests — 3.1 points clear of suspension, so it is the first thing to check.
At component level the recurring items are non catalyst emissions, service brake performance and headlamp aim — non catalyst emissions alone was recorded 35 times.
A 60-90k example is materially riskier than a 0-30k one: 25.7% versus 16.5%.
Advisories point at the next bill rather than this one: suspension was flagged on 27.8% of tests without failing them.
The trend is improving — the fail rate fell from 23.2% in 2021 to 18.8% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 12.1% | 46 |
| 2 | Suspension | 8.9% | 34 |
| 3 | Emissions & environmental | 7.9% | 30 |
| 4 | Brakes | 7.9% | 30 |
| 5 | Body, structure & corrosion | 6.6% | 25 |
| 6 | Visibility | 5.5% | 21 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Non catalyst emissions | 35 |
| 2 | Service brake performance | 25 |
| 3 | Headlamp aim | 24 |
| 4 | Rear fog lamp | 18 |
| 5 | Ball joint | 17 |
| 6 | Washers | 14 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 27.8% | 106 |
| 2 | Emissions & environmental | 17.1% | 65 |
| 3 | Body, structure & corrosion | 15.5% | 59 |
| 4 | Brakes | 10.5% | 40 |
| 5 | Tyres | 8.1% | 31 |
| 6 | Other defects | 7.9% | 30 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 103 | 16.5% |
| 30-60k | 110 | 19.1% |
| 60-90k | 140 | 25.7% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 95 | 23.2% |
| 2022 | 86 | 22.1% |
| 2023 | 95 | 22.1% |
| 2024 | 73 | 23.3% |
| 2025 | 32 | 18.8% |
What to check before buying a 1984 Mini 25
On a 1984 Mini 25, lighting & signalling is what the MOT record says goes wrong most — it appeared in 12.1% of tests. Check these areas before you commit.
- Lighting & signalling (12.1% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (8.9% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
- Emissions & environmental (7.9% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 1984 Austin Mini 25s pass their MOT?
77.7% of the 381 1984 Austin Mini 25 MOT tests in this dataset passed — a 22.3% fail rate.
What is the most common MOT failure on a 1984 Austin Mini 25?
Lighting & signalling, recorded in 12.1% of tests, followed by suspension (8.9%).
Does the 1984 Mini 25 get worse with mileage?
Its MOT fail rate rises from 16.5% in the 0-30k band to 25.7% in the 60-90k band.
Methodology & source. Based on 381 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.