Reliability Report · Multi-Source Data

Seat Mii Reliability

The Seat Mii (current generation) scores 70/100 on our composite reliability index — good territory — drawn from ADAC, DVSA data.

Composite Score
70
/ 100
Good
Sources: ADAC · DVSA · latest 2025
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Reliability data covers the model. A VIN history report covers the exact Seat Mii you're looking at — accident and write-off records, mileage rollback, outstanding finance and theft checks.

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Reliability by Source

Each independent organization measures reliability differently. TÜV reports inspection defect rates by age band. ADAC reports pan-European breakdowns per 1,000 vehicles. NHTSA aggregates US consumer complaints. DVSA MOT data is the UK fleet's annual safety inspection — every car 3+ years old. Lower variance across sources = higher confidence in the composite.

ADAC (European Auto Club)
All model years · 2025 report
13.4/1000 breakdowns
View source ↗
56
/ 100
DVSA MOT (UK Inspections)
Model years 2010–2021 · 2024 report · n=22355
22,355 UK MOT tests · overall 18.2% fail rate vs UK fleet baseline
View source ↗
80
/ 100
DVSA MOT (UK Inspections)
Model years 2009–2020 · 2023 report · n=16364
16,364 UK MOT tests · overall 16.0% fail rate vs UK fleet baseline
View source ↗
80
/ 100

UK MOT Reliability Detail

Based on 22,355 MOT tests in the UK during the 2024 reporting period. Score for each age band reflects this model's fail rate vs the UK-fleet baseline fail rate at the same age — a generation-aware metric.

Age 3–5 yrs
83
7.5% fail vs 10.9% fleet
1,736 tests
Age 6–9 yrs
76
16.1% fail vs 19.2% fleet
9,921 tests
Age 10–14 yrs
83
21.9% fail vs 32.1% fleet
10,698 tests

Most Common MOT Failure Categories

#1
Service brake performance
1,106
26.4%
#2
Catalyst emissions
919
21.9%
#3
Condition
860
20.5%
#4
Wipers
705
16.8%
#5
Tread depth
607
14.5%

Categories ranked across all MOT tests of this model in the UK during the 2024 period. "Condition" covers cosmetic / wear issues; suspension and braking dominate the rest.

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