Pass rate
84.9%
Around average — 2.8 pts ahead of the 82.1% that cars this age and mileage manage.
Across 9,255 recorded tests.
Typical repair bill £47–£147
2015 SEAT Mii MOT pass rate
- 2015
- typical 49,578 mi
Most common fault
Tyres
28.8% of faults · 19.8% nationally
mostly tread below the limit, cuts and sidewall bulges.
Part only £55–£85 for Tread depth below 1.6 mm. What fitting it takes →
1.9 pts down across model years — 5.1% in 2012, 3.2% in 2021.
Which year to buy
- Best 2019 92.4% pass
- Avoid 2012 81.6% pass
Across the 10 years on record, a spread of 10.8 points. See every year →
- First-attempt pass
- 82.4%
- Typical mileage
- 50k mi
The 2015 SEAT Mii MOT pass rate is 84.9% of its MOT tests — 2.8 points ahead of what its age and mileage predict. Tyres is the biggest single reason it fails, at 28.8% of what testers record.
Check your postcode
MOT pass rates are national — type your postcode to see how SEAT Mii does in your corner of the country.
Expert verdict
Tyres: 1.5× the national share
Tyres make up 28.8% of everything recorded on the 2015 SEAT Mii, against 19.8% nationally — 9.0 points above. Check all four tyres yourself, including the inner shoulders, and look at the date stamp — a tyre can pass on tread and still be six years old.
- When it fails, it costs. Only 28% of this model’s typical repairs come in under £30 in parts — the failures here tend to be the kind that need a garage rather than a bulb.
Written from this page's own figures: fault shares against the national composition, the like-for-like pass rate, and the priced repair list. How these are worked out
Watching a SEAT Mii? Get an email when these numbers change .
How does the 2015 SEAT Mii compare?
Cars of this age and mileage average 82.1%, so this figure is 2.8 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 82.4%. The median 2015 SEAT Mii in this dataset had covered 49,578 mi.
Pass rates also shift with the test month: tests recorded October–March passed 84.1% of the time, April–September 85.7%.
The single most recorded failure item is "Service brake performance excessively binding", noted on 1.76% of tests.
- 9,255 recorded tests behind this page.
- 84.9% overall pass rate, 82.4% on a first attempt.
- Across every year of the SEAT Mii, the average is 85.4% — best year 2019 (92.4%), worst 2012 (81.6%).
Figures count every completed test on this vehicle-year in the dataset, including retests. See methodology for the exact definition.
This page's data
- Tests analysed
- 9,255
- Typical mileage (median)
- 49,578 mi
- Make and model
- SEAT Mii
- Updated
- 2026-11-05
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Brake Servicing
Typically a garage job — get quotes before committing.
Does mileage affect the Mii MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 64% so small gaps stay visible.
Regional pass rates for the Mii
| Region | Tests | Pass rate |
|---|---|---|
| South East | 1,642 | 86.9% |
| South West | 1,138 | 86.6% |
| North West | 954 | 87.6% |
| Yorkshire | 952 | 82.8% |
| East of England | 919 | 87.9% |
| Scotland | 867 | 78.3% |
| West Midlands | 815 | 83.7% |
| Wales | 750 | 81.9% |
| East Midlands | 626 | 85.3% |
| North East | 440 | 82.3% |
| London | 152 | 90.1% |
Regions come from the postcode area recorded at the test station. Areas on region borders are assigned to the region with the majority of their population.
What fails a 2015 Mii
Everything a tester recorded on this vehicle, grouped into the inspection sections that produced it. The notch on each bar is the national share, so you can see at a glance whether this car is unusual or just ordinary.
A test can record several items, so these percentages do not add up to 100%. The exact strings, with prices, are in the full DVSA record at the bottom of this page.
Before your test
Three checks worth doing on a 2015 Mii
These are not generic tips — they are the faults recorded most often on this exact model, rewritten as things you can check yourself. All three take about ten minutes and cost nothing.
-
Check the windscreen 1.6% of tests
“windscreen damaged”
Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.
-
Check the exhaust and emissions 1.6% of tests
“catalyst emissions Lambda reading after 2nd fast idle outside specified limits”
Listen for a blow at idle and have someone rev it gently. Then look at the tailpipe smoke: blue is oil, white when warm is coolant, black is over-fuelling. Any of those and the emissions test is the least of it.
-
Check the lights 1.4% of tests
“position lamp not working”
Switch everything on and walk round the car: both headlamps on dip and main, every indicator, both brake lights, reverse, fog and the two number-plate lamps. A bulb is a few pounds and a five-minute job.
Shares are the proportion of tests on this vehicle that recorded the item, so they overlap: one test can record several.
What it costs to get a 2015 Mii through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £47–£147 — and 28% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £47–£147
- Cheapest common item: wipers does not clear the windscreen…
- £8–£22
- Dearest common item: fuel cap/sealing device ineffective
- £80–£250
- Common items a careful owner can do at home
- 40%
- Repairs that still cost under £30
- 28%
Estimates from typical UK parts prices, weighted by how often each item appears in 9,255 MOT tests on this vehicle. They exclude diagnostics, retest fees and garage labour where the part is a DIY fit, and they are not figures from the DVSA dataset. Older and higher-mileage examples cost more than the average. How these estimates are built → · All MOT repair costs → · Cheapest cars to put through a test →
Every year of the Mii, side by side
10 model years on record, from 2012 to 2021. Across them the pass rate runs from 81.6% to 92.4% — a spread of 10.8 points. The bar under each year is the item that failed it most often.
- 2012 81.6% srs malfunction indicator lamp…
- 2013 82.4% service brake performance…
- 2014 84.7% service brake performance…
- 2015 84.9%service brake performance…
- 2016 85.0% pins and bushes pin or bush…
- 2017 87.9% pins and bushes pin or bush…
- 2018 89.9% wipers does not clear the…
- 2019 92.4% headlamp aim too low
- 2020 91.0% has a bulge, caused by separation…
- 2021 90.5% has a bulge, caused by separation…
Colour is the pass rate on a fixed scale, so a block means the same thing on any model. Each year links to its own page with the full fault breakdown.
Compare the 2015 SEAT Mii with another year
The raw pass rate mostly measures age. The year comparison adds the like-for-like figure, the mileage bands and the repair bill.
Other 2015 cars with a similar record
- Ford Mondeo 84.9%
- Skoda Yeti 84.9%
- Volvo XC70 84.9%
- Smart Mcc Fortwo 85.0%
- Mitsubishi Shogun 85.0%
- Toyota Avensis 84.8%
Closest pass rates among 2015 cars with at least 2,000 tests, so a small sample cannot flatter itself into the list. See the full rankings: best and worst MOT pass rates.
The full DVSA record for the 2015 SEAT Mii 10 failure items · 6 advisories · 10 inspection categories · mileage brackets · all of it in the page, none of it above the fold
Every inspection category
Shares of the 10,344 individual items recorded on this vehicle, and the same share across all cars nationally. A single test can record several items, so a row is not a percentage of tests.
| Category | Items | This car | Nationally | Difference |
|---|---|---|---|---|
| Tyres | 3,015 | 28.80% | 19.76% | +9.04 |
| Brakes | 2,625 | 25.10% | 20.89% | +4.21 |
| Suspension | 1,281 | 12.30% | 20.98% | −8.68 |
| Lamps, reflectors and electrical equipment | 880 | 8.40% | 12.21% | −3.81 |
| Noise, emissions and leaks | 729 | 7.00% | 5.52% | +1.48 |
| Non-component advisories | 582 | 5.60% | 4.18% | +1.42 |
| Visibility | 571 | 5.50% | 4.97% | +0.53 |
| Body, chassis, structure | 414 | 4.00% | 5.57% | −1.57 |
| Identification of the vehicle | 161 | 1.50% | 1.76% | −0.26 |
| Road Wheels | 86 | 0.80% | 0.75% | +0.05 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Service brake performance excessively binding Brakes | Major | 1.8% | £60–150 |
| Fuel cap/sealing device ineffective Body, chassis, structure | Major | 1.7% | £80–250 |
| Windscreen damaged but not adversely affecting driver's view Visibility | Minor | 1.6% | £80–200 |
| Catalyst emissions Lambda reading after 2nd fast idle outside specified limits Noise, emissions and leaks | Major | 1.6% | £60–250 |
| Position lamp not working Lamps, reflectors and electrical equipment | Rectified | 1.4% | £5–25 |
| Pins and bushes pin or bush excessively worn Suspension | Major | 1.3% | £40–150 |
| Position lamp not working Lamps, reflectors and electrical equipment | Major | 1.3% | £5–25 |
| Wipers does not clear the windscreen effectively Visibility | Major | 1.3% | £8–22 |
| Tread depth below requirements of 1.6mm Tyres | Major | 1.1% | £45–95 |
| Catalyst emissions carbon monoxide content after 2nd fast idle exceeds default limits Noise, emissions and leaks | Major | 1.0% | £60–250 |
Severity is as recorded: Major and Dangerous fail the test outright; Minor and Advisory do not. Costs are estimates from typical UK parts prices — see how they are built.
What testers noted without failing the car
Advisories are the early warnings — the same parts a year or two before they fail. Reading them is how you tell a car that has been maintained from one that has been patched.
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 14.1% | £45–95 |
| Tread depth below requirements of 1.6mm Tyres | Advisory | 12.9% | £45–95 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 7.0% | £45–110 |
| Pins and bushes pin or bush excessively worn Suspension | Advisory | 6.4% | £40–150 |
| Brake pads less than 1.5 mm thick Brakes | Advisory | 4.3% | £18–45 |
| Service brake performance excessively binding Brakes | Advisory | 2.9% | £60–150 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 1,518 | 91.5% | 21,765 mi |
| 30-60k | 4,674 | 86.5% | 45,071 mi |
| 60-90k | 2,372 | 80.7% | 71,773 mi |
| 90-120k | 551 | 74.0% | 100,603 mi |
| 120k+ | 129 | 72.1% | 135,337 mi |
Source: 9,255 recorded tests on this vehicle-year. Every row above is recomputed from the same DVSA extract as the rest of the page — see the methodology.
2015 Mii MOT questions
What is the MOT pass rate for a 2015 SEAT Mii?
84.9% of the 9,255 2015 SEAT Mii tests in this dataset passed, against a national average of 82.1% for cars first used in 2015. First-attempt pass rate: 82.4%.
What are the most common MOT failures on a 2015 SEAT Mii?
The three most recorded items are service brake performance excessively binding (1.76%), fuel cap/sealing device ineffective (1.66%), windscreen damaged but not adversely affecting driver's view (1.65%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2015 SEAT Mii MOT pass rate?
Yes. Cars under 30,000 miles passed 91.5% of the time, falling to 72.1% for those over 120,000 miles. The median 2015 SEAT Mii in this dataset had covered 49,578 mi.
Does the season affect the 2015 SEAT Mii MOT pass rate?
Tests recorded in the winter months (October–March) passed 84.1% of the time; summer months (April–September) passed 85.7%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.