Seat Mii reliability, MOT pass rate and rarity

Time Period & Model

Time period snapshot: Last 5 years

Manufacturer: Seat

Model: Mii

Model reliability rank

MOT-based rank from 106,262 selected-period tests.

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Overall MOT pass rate

81.7%

Share of this model's 106,262 selected-period MOT tests that pass.

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Efficiency, emissions & tax

Average MPG

64.2 mpg

CO2 emission

102 g/km

Euro emissions

Euro 6

Tax cost

£90/yr

Vehicle list price over £40,000?NoYes

Average vehicle miles

59,030

Lower average mileage in the analysed fleet.

Life expectancy miles

64,548

Lower mature-fleet mileage expectation.

Average vehicle age

10.4

Average age sits in the mid-fleet band.

Vehicles represented

16,586

16,586 valid MOT, 0 under 3 years.

Tests analysed

106,262

106,262 MOT tests in the selected period.

Rarity ranking

Based on Make & Model

Scarce

16,586On the road

Insight summary

Seat Mii is a scarce model in this snapshot, with 16,586 represented vehicles and 0.04% of the active UK pool tracked by AutoRank. For the last 5 years, it has a pass rate of 81.7% from 106,262 MOT tests, with a reliability score of 54. The current pool shows an average of 59,030 miles and an average age of 10.4 years, while mature-fleet mileage is estimated at 64,548 miles. Petrol leads the fuel split, followed by diesel, and the most frequent defect themes are lighting, braking components and windscreen damage. The practical read is that the Seat Mii looks like a solid used-car baseline rather than a rare find, with age, mileage and common wear items doing most of the explaining.

Fuel type breakdown (by model)

Fuel	Vehicles
PETROL	16,584
DIESEL	1
ELECTRIC	1

Euro NCAP Safety

NCAP rating

3 / 5

Adult

81%

Children

83%

Pedestrian

46%

Safety systems

55%

Top 25 most common defects (by model)

Defect	Count
Supplementary restraint system warning lamp indicates a fault (7.1.6 (a))	1,342
Offside Rear Service brake excessively binding (1.2.1 (f))	1,042
Nearside Rear Service brake excessively binding (1.2.1 (f))	1,026
Nearside Front Position lamp not working (4.2.1 (a) (ii))	915
Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))	910
Exhaust Lambda reading after 2nd fast idle outside specified limits (8.2.1.2 (c))	894
Registration plate lamp inoperative in the case of a single lamp or all lamps (4.7.1 (b) (ii))	856
Offside Front Position lamp not working (4.2.1 (a) (ii))	833
Fuel cap/sealing device ineffective (6.1.3 (b) (i))	814
Nearside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))	796
Offside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))	641
Nearside Headlamp aim too low (4.1.2 (a))	590
Parking brake efficiency below requirements (1.4.2 (a) (i))	587
Windscreen washer provides insufficient washer liquid (3.5 (a))	573
Nearside Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))	541
Rear Brakes imbalanced across an axle Axle 2 (1.2.1 (b) (i))	517
Parking brake lever has excessive movement indicating incorrect adjustment (1.1.6 (c))	505
Offside Headlamp aim too low (4.1.2 (a))	488
Nearside Front Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))	461
Offside Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))	451
Exhaust carbon monoxide content after 2nd fast idle exceeds default limits (8.2.1.2 (b))	449
Exhaust carbon monoxide content after 2nd fast idle exceeds manufacturer's specified limits (8.2.1.2 (a))	442
Offside Front Coil spring fractured or broken (5.3.1 (b) (i))	421
Offside Front Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))	399
Front Brake pad(s) less than 1.5 mm thick (1.1.13 (a) (ii))	396

All 25 defects ranked by recorded countShowing 16,889 defects across this top 25 set

Supplementary restraint system warning lamp indicates a fault (7.1.6 (a))

1,342

Offside Rear Service brake excessively binding (1.2.1 (f))

1,042

Nearside Rear Service brake excessively binding (1.2.1 (f))

1,026

Nearside Front Position lamp not working (4.2.1 (a) (ii))

915

Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))

910

Exhaust Lambda reading after 2nd fast idle outside specified limits (8.2.1.2 (c))

894

Registration plate lamp inoperative in the case of a single lamp or all lamps (4.7.1 (b) (ii))

856

Offside Front Position lamp not working (4.2.1 (a) (ii))

833

Fuel cap/sealing device ineffective (6.1.3 (b) (i))

814

Nearside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))

796

Offside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))

641

Nearside Headlamp aim too low (4.1.2 (a))

590

Parking brake efficiency below requirements (1.4.2 (a) (i))

587

Windscreen washer provides insufficient washer liquid (3.5 (a))

573

Nearside Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))

541

Rear Brakes imbalanced across an axle Axle 2 (1.2.1 (b) (i))

517

Parking brake lever has excessive movement indicating incorrect adjustment (1.1.6 (c))

505

Offside Headlamp aim too low (4.1.2 (a))

488

Nearside Front Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))

461

Offside Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))

451

Exhaust carbon monoxide content after 2nd fast idle exceeds default limits (8.2.1.2 (b))

449

Exhaust carbon monoxide content after 2nd fast idle exceeds manufacturer's specified limits (8.2.1.2 (a))

442

Offside Front Coil spring fractured or broken (5.3.1 (b) (i))

421

Offside Front Windscreen wiper does not clear the windscreen effectively (3.4 (b) (ii))

399

Front Brake pad(s) less than 1.5 mm thick (1.1.13 (a) (ii))

396

Seat Mii reliability and MOT data