Seat Mii Reliability, MOT Pass Rate & Common Faults
Free Seat Mii car check
Is the Seat Mii reliable? We analysed 178,602 real MOT tests across 18,080 vehicles to find out.
Got a specific Seat Mii? Enter the reg for a free check:
The Seat Mii is above average for reliability based on real UK MOT data. Here's everything you need to know before buying a used Seat Mii.
Seat Mii Number Plates
Number plates registered to a Seat Mii. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Seat Mii MOT Pass Rate by Year
How likely is a Seat Mii to pass its MOT? Here's the pass rate for each registration year, newest first.
Seat Mii Common Faults & Problems
These are the most common serious faults found on Seat Mii models during MOT testing — flagged as dangerous or major failures that need immediate attention.
Seat Mii Mileage — What's Normal?
How many miles does a typical Seat Mii owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Seat Mii MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Seat Mii year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2019 | 6,637 | 89.2% | 13,076 | 21,900 | 34,245 |
| 2018 | 7,815 | 86.9% | 15,496 | 24,933 | 37,728 |
| 2017 | 11,288 | 86.3% | 17,472 | 28,530 | 43,265 |
| 2016 | 19,607 | 83.4% | 20,888 | 32,722 | 47,876 |
| 2015 | 27,023 | 83.6% | 23,097 | 35,562 | 52,296 |
| 2014 | 34,892 | 84.1% | 25,015 | 39,182 | 57,549 |
| 2013 | 45,343 | 81.5% | 27,468 | 43,697 | 64,104 |
| 2012 | 25,019 | 80.7% | 28,257 | 45,229 | 67,660 |
How Long Does a Seat Mii Last?
Based on 18,080 Seat Mii vehicles on UK roads.
Seat Mii Mileage Distribution
Total mileage recorded across all Seat Mii MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Seat Mii
Based on MOT pass rates across all registration years with sufficient test data.
89.2% MOT pass rate from 6,637 tests
80.7% MOT pass rate from 25,019 tests
The best year to buy a used Seat Mii is 2019, which has the highest MOT pass rate at 89.2% across 6,637 tests. The 2012 model year has the lowest pass rate at 80.7% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Seat Mii Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Seat Mii THIS CAR | 83.2% | 178,602 | 37,396 mi | 14 yrs |
| Seat Ibiza | 73.7% | 3,964,856 | 60,259 mi | 31 yrs |
| Seat Leon | 78% | 3,000,659 | 70,859 mi | 26 yrs |
| Seat Alhambra | 72.5% | 690,916 | 95,606 mi | 30 yrs |
| Alfa Romeo Gtv | 65.7% | 93,802 | 80,546 mi | 30 yrs |
Compared to the Seat Ibiza (73.7% pass rate) and the Seat Leon (78.0% pass rate), the Seat Mii outperforms both on MOT reliability.
Found a Seat Mii you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Seat MiiShould you buy a used Seat Mii?
The Seat Mii has an overall MOT pass rate of 83.2% across 178,602 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
On the safety side, the most frequently flagged dangerous fault is tyre tread depth below requirements of 1.6mm. Dangerous faults cause an immediate MOT failure and mean the vehicle is not roadworthy until repaired. If you're viewing a Seat Mii with an expired or recently passed MOT, ask the seller whether any dangerous faults were found and fixed during the last test.
A typical Seat Mii owner drives around 4,559 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Seat Mii models stay on UK roads for around 14 years. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.