2019 SEAT Mii — MOT failures & pass rate
5,680 MOT tests on the 2019 SEAT Mii are in this dataset, and 93.2% of them passed. All cars of a similar age fail 10.1% of the time, so this is 3.3pp better than the group it competes with. Failures cluster in lighting & signalling, tyres and visibility.
What the MOT record shows
No single area dominates — lighting & signalling (4.0%) and tyres (3.0%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are headlamp aim, service brake performance and washers — headlamp aim alone was recorded 201 times.
A 60-90k example is materially riskier than a 0-30k one: 21.0% versus 4.5%.
Tyres is the most common advisory, noted on 19.2% of tests — work that passed today but is likely due soon.
The trend is worsening — 1.6% of tests failed in 2021 against 10.2% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 4.0% | 230 |
| 2 | Tyres | 3.0% | 172 |
| 3 | Visibility | 2.3% | 133 |
| 4 | Brakes | 2.3% | 128 |
| 5 | Suspension | 0.9% | 49 |
| 6 | Other defects | 0.1% | 7 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 201 |
| 2 | Service brake performance | 76 |
| 3 | Washers | 76 |
| 4 | Wipers | 74 |
| 5 | Position lamp | 65 |
| 6 | Tread depth | 61 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 19.2% | 1,089 |
| 2 | Brakes | 8.0% | 456 |
| 3 | Other defects | 5.1% | 290 |
| 4 | Suspension | 2.7% | 155 |
| 5 | Visibility | 1.9% | 111 |
| 6 | Emissions & environmental | 0.7% | 41 |
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 | 4,006 | 4.5% |
| 30-60k | 1,471 | 10.8% |
| 60-90k | 176 | 21.0% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 64 | 1.6% |
| 2022 | 1,396 | 4.0% |
| 2023 | 1,407 | 6.3% |
| 2024 | 1,380 | 7.0% |
| 2025 | 1,433 | 10.2% |
What to check before buying a 2019 Mii
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 4.0% of tests. Start there.
- Lighting & signalling (4.0% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Tyres (3.0% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Visibility (2.3% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
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 2019 SEAT Miis pass their MOT?
93.2% of the 5,680 2019 SEAT Mii MOT tests in this dataset passed — a 6.8% fail rate.
What is the most common MOT failure on a 2019 SEAT Mii?
Lighting & signalling, recorded in 4.0% of tests, followed by tyres (3.0%).
Does the 2019 Mii get worse with mileage?
Its MOT fail rate rises from 4.5% in the 0-30k band to 21.0% in the 60-90k band.
Methodology & source. Based on 5,680 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.