Does the Seat Mii fail the MOT on body, chassis and structure more than it should?

The Seat Mii records 1.72 body, chassis and structure failure items per 100 initial MOT tests (2019–2024), against 2.07 expected for a car of the same age mix: about as expected for its class and age (the difference is within its interval or under 0.5 items per 100 tests) (−0.35, 95% interval −0.44 to −0.26). It ranks 317 of 663 models on body, chassis and structure (1 = most failures above expected).

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on body, chassis and structure · check a Seat Mii by registration

What exactly fails on body, chassis and structure?

The most frequent DVSA defect wording in this group on the Seat Mii is “Fuel system leaking, or missing or ineffective filler cap”, recorded 930 times in 2019–2024.

Seat Mii: most frequent body, chassis and structure defect wordings, 2019–2024 (30+ items each)
DVSA defect wording	Items	Per 100 tests
Fuel system leaking, or missing or ineffective filler cap	930	0.94
Exhaust system leaking or insecure	273	0.28
A transmission shaft constant velocity joint boot severely deteriorated	112	0.11
Fire risk due to fuel tank shield or exhaust shield missing where fitted as original equipment	99	0.10
A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc	87	0.09

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 99,179 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

Does the Seat Mii fail the MOT on body, chassis and structure more than it should?

What exactly fails on body, chassis and structure?

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