Seat Arona 2018: MOT failure rate for its age

15.3% of 48,781 MOT tests of the Seat Arona first registered in 2018 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 104.3 (95% CI 101.9–106.7; 100 = normal for this model at that age): close to other build years of the same model at the same age (within 5 points of normal).

Seat Arona built in 2018 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	15.3	%	all ages tested	2019–2024	48781
Index against this model at the same age (95% CI 101.9–106.7)	104.3	index	100 = normal for this model at that age	2019–2024	48781
Rank among this model's 4 build years	3	of 4	1 = fails least for its age	2019–2024	48781
Tested in 2024	12128	tests	median 39,389 miles	2024	12128

Built 2018 against Seat Arona normal for the age: first-time MOT failure share at each age, age 3: 9.7% vs 10.8%; age 4: 11.2% vs 11.1%; age 5: 18.3% vs 15.3%; age 6: 21.9% vs 21.5%. Axis from 0% to 30%. DVSA MOT bulk data, 2019–2024.

Check a 2018 Seat Arona by registration · All Seat Arona MOT statistics · Download the build-year table (CSV)

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).

How does the 2018 Seat Arona fail at each age?

Cars built in 2018 were tested at ages 3 to 6 between 2019 and 2024. Each row compares their first-time failure share with what this model normally shows at that age, after allowing for the overall failure level of each test year.

Seat Arona built 2018: first-time MOT failure by age, against the model's normal rate at that age (2019–2024)
Age	Tests	Failed, %	95% interval	Normal for this model at that age, %	Index (100 = normal)
3	12,356	9.7	9.2–10.3	10.8	90.3
4	12,161	11.2	10.6–11.7	11.1	100.8
5	12,136	18.3	17.6–19	15.3	119.8
6	12,128	21.9	21.2–22.7	21.5	102.3

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 48,781 (initial tests) · Method: normal rate = this model's first-time failure share at that age across its build years (cells of 400+ tests), adjusted for each test year's overall level; cells of 30+ tests, under 500 marked rough · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

What fails most on the 2018 Seat Arona?

The most common failure group on cars built in 2018 is steering: 10.2 items per 100 first tests, against 5.3 across all build years of the Seat Arona. These counts are not age-adjusted: cars built in 2018 were tested at ages 3 to 6.

Failure items per 100 first tests, Seat Arona built 2018 against the Seat Arona in all build years (2019–2024, not age-adjusted)
Failure group	Built 2018, per 100	All build years, per 100	Items
Steering	10.2	5.3	5,010
Tyres	7	6.1	3,432
Brakes	5.6	5.6	2,769
Visibility	2.8	2.8	1,376
Lamps, reflectors and electrical equipment	1.4	1.2	669

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 49,173 (initial tests of this build year) · Method: failure items grouped by DVSA's top-level defect groups, per 100 initial tests; groups with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How does 2018 compare with the years around it?

Among the 4 published build years of the Seat Arona, 2018 ranks 3 (1 = fails least for its age). 2017: index 103.7. 2019: index 96.6.

Seat Arona build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2017	103.7	95.0–112.3	no different (rough estimate)	3,054
2018	104.3	101.9–106.7	worse	48,781
2019	96.6	94.0–99.2	better	44,793
2020	105.2	101.0–109.4	worse	21,659

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 118,287 (initial tests) · Method: observed failures against those expected for the same model at the same ages, test-year level adjusted; verdict follows the printed one-decimal bound · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How to cite this page

MOT Risk Index (2026). Seat Arona 2018 MOT statistics (data release dvsa-2024-v2; full dataset motriskindex-families-2024-v5, DOI 10.5281/zenodo.22975051), updated 30 September 2026. motriskindex.co.uk/cars/seat-arona/2018/

How every figure is calculated: methodology. Age, test year and build year are tied together (age = test year − build year), so the test-year level is taken as observed, not estimated.

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