SEAT Mii MOT pass rate and common problems
83.3% of 25,575 SEAT Mii MOT tests pass.
The Mii has a pass rate of 83.3%, a little higher than the average across all SEAT models (80.3%).
The SEAT Mii has a pass rate of 83.3%, a little higher than the national average for cars (79.2%).
Own this SEAT Mii?
This is the average across every SEAT Mii in the dataset. Look up your own registration for its actual MOT history, and a free place to keep its maintenance records.
Have service invoices? Upload and keep them with your car’s history →
How to check and keep your SEAT’s service history →
Pass rate by vehicle age
Pass rate declines noticeably with age, from 90.7% at 0–3 years to 78.6% at 10–15 years.
| Vehicle age | Pass rate | Tests | Average mileage |
|---|---|---|---|
| 0–3 years | 90.7% | 1,113 | 18,650 miles |
| 3–6 years | 91.3% | 3,927 | 26,855 miles |
| 6–10 years | 83.5% | 11,644 | 47,927 miles |
| 10–15 years | 78.6% | 8,891 | 65,366 miles |
| 15+ years | no tests recorded | 0 | no reading |
Common MOT failure reasons for the SEAT Mii
The most common reason the SEAT Mii fails its MOT is lamps, reflectors and electrical equipment — present in 37.9% of failed tests, most often logged as "Not working".
| Category | Share of failed tests | Example |
|---|---|---|
| Lamps, reflectors and electrical equipment | 37.9% | Not working |
| Brakes | 34.7% | Excessively binding |
| Tyres | 21.5% | Tread depth below requirements of 1.6mm |
| Visibility | 15.9% | Does not clear the windscreen effectively |
| Suspension | 15.7% | Pin or bush excessively worn |
| Noise, emissions and leaks | 15.1% | Lambda reading after 2nd fast idle outside specified limits |
| Body, chassis, structure | 9.9% | Ineffective |
| Seat belts and supplementary restraint systems | 5.9% | Warning lamp indicates a fault |
| Identification of the vehicle | 0.8% | Inscription illegible |
| Steering | 0.6% | Ball joint has excessive play |
Buying a used SEAT Mii: what to check
These checks follow the SEAT Mii’s own MOT record: the areas it fails on most often, and how that changes as the car gets older. None of them replaces a mechanic’s inspection, but they tell you where to look first.
The biggest drop in pass rate for the SEAT Mii comes between 3–6 years and 6–10 years old, from 91.3% to 83.5%. If you are looking at one in or just past that range, read its MOT history closely.
By mileage, the steepest fall is from 60,000–90,000 mi to 90,000–120,000 mi: 77.2% down to 69.0%. Mileage matters as well as age, so compare the car’s recorded mileages with its year.
1. Lights and electrics
Recorded in 37.9% of failed SEAT Mii MOTs. 10.0% of tests at 10–15 years failed on lights and electrics, against 2.3% at 0–3 years.
Walk round with the lights on: headlights (dipped and main), indicators, brake lights, fog light and number-plate lamp. Check the dashboard warning lights come on with the ignition, then go out once the engine starts.
2. Brakes
Recorded in 34.7% of failed SEAT Mii MOTs. Rare on young cars, but 11.6% of tests at 10–15 years failed on brakes.
On the test drive, the car should stop straight without pulling or juddering, and the handbrake should hold it on a slope. Look through the wheels for scored or heavily lipped discs.
3. Tyres
Recorded in 21.5% of failed SEAT Mii MOTs.
Check tread depth across the whole width of every tyre, including the inner edge. Uneven wear can point to alignment or suspension problems. Look for cuts and bulges in the sidewalls.
4. Windscreen and wipers
Recorded in 15.9% of failed SEAT Mii MOTs. 3.8% of tests at 10–15 years failed on windscreen and wipers, against 1.6% at 0–3 years.
Look for windscreen chips and cracks in the driver’s line of sight, and check the wipers clear the screen and the washers work.
5. Suspension
Recorded in 15.7% of failed SEAT Mii MOTs. 4.6% of tests at 10–15 years failed on suspension, against 2.2% at 0–3 years.
Listen for knocks over bumps and speed humps, and check the car sits level. Push down on each corner: it should settle rather than keep bouncing.
Check the car’s own MOT history. Averages describe the model, not the car in front of you. Look up its registration for past failures, advisories that were never fixed, and gaps or dips in the recorded mileage.
Ask for the service history. Invoices show what was done and when; a stamp alone shows less. See how to check SEAT service history and what a service history check can tell you.
Related SEAT models
- SEAT Arona — 88.4% pass rate
- SEAT Ateca — 91.3% pass rate
- SEAT Alhambra — 78.9% pass rate
- SEAT Altea — 66.7% pass rate
- SEAT Tarraco — 88.9% pass rate
- SEAT Toledo — 74.3% pass rate
Frequently asked questions
- What is the MOT pass rate for the SEAT Mii?
- 83.3% of SEAT Mii MOT tests pass, based on 25,575 tests in the DVSA anonymised MOT tests and results dataset.
- What are the most common MOT failures for the SEAT Mii?
- The most common reason the SEAT Mii fails its MOT is lamps, reflectors and electrical equipment — present in 37.9% of failed tests, most often logged as "Not working".
- What are the common problems with the SEAT Mii?
- Going by its MOT results, the most common problem areas on the SEAT Mii are lights and electrics; brakes; tyres. 10.0% of tests at 10–15 years failed on lights and electrics, against 2.3% at 0–3 years.
- What should I check when buying a used SEAT Mii?
- Start with the areas it most often fails its MOT on: lights and electrics; brakes; tyres; windscreen and wipers; suspension. Then check the specific car's MOT history by registration for failures, advisories and mileage, and ask the seller for service invoices.
- Does this show the SEAT Mii's service history?
- No — this is MOT test data, which covers roadworthiness, not servicing. A service history is a separate record of maintenance work, which a specific car only has if its owner has kept it. See the SEAT service history guide for how to check and keep one.