Toyota Prius 2018: MOT failure rate for its age

12.4% of 51,183 MOT tests of the Toyota Prius 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 89.3 (95% CI 87.1–91.5; 100 = normal for this model at that age): the 2018 Toyota Prius fails less often than other build years of the same model at the same age.

Toyota Prius built in 2018 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	12.4	%	all ages tested	2019–2024	51183
Index against this model at the same age (95% CI 87.1–91.5)	89.3	index	100 = normal for this model at that age	2019–2024	51183
Rank among this model's 20 build years	4	of 20	1 = fails least for its age	2019–2024	51183
Tested in 2024	15131	tests	median 81,728 miles	2024	15131

Built 2018 against Toyota Prius normal for the age: first-time MOT failure share at each age, age 3: 11.9% vs 12.4%; age 4: 12.1% vs 13.4%; age 5: 12.7% vs 13.9%; age 6: 12.6% vs 15.2%. Axis from 0% to 20%. DVSA MOT bulk data, 2019–2024.

Check a 2018 Toyota Prius by registration · All Toyota Prius 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 Toyota Prius 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.

Toyota Prius 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	10,820	11.9	11.3–12.5	12.4	95.7
4	11,762	12.1	11.6–12.7	13.4	90.7
5	13,470	12.7	12.1–13.2	13.9	90.9
6	15,131	12.6	12.1–13.2	15.2	83.2

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 51,183 (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 Toyota Prius?

The most common failure group on cars built in 2018 is tyres: 4 items per 100 first tests, against 5.3 across all build years of the Toyota Prius. These counts are not age-adjusted: cars built in 2018 were tested at ages 3 to 6.

Failure items per 100 first tests, Toyota Prius built 2018 against the Toyota Prius in all build years (2019–2024, not age-adjusted)
Failure group	Built 2018, per 100	All build years, per 100	Items
Tyres	4	5.3	2,363
Lamps, reflectors and electrical equipment	3.5	14.6	2,091
Visibility	3.4	5	2,011
Suspension	2.4	7.2	1,393
Brakes	1.3	4.9	762

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 59,230 (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 20 published build years of the Toyota Prius, 2018 ranks 4 (1 = fails least for its age). 2017: index 80.8. 2019: index 108.0.

Toyota Prius build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2001	86.4	73.7–99.1	better (rough estimate)	513
2002	93.0	77.3–108.6	no different (rough estimate)	370
2003	101.3	90.7–111.9	no different (rough estimate)	906
2004	103.1	99.0–107.2	no different	6,230
2005	101.3	98.7–103.8	no different	16,301
2006	105.1	102.9–107.3	worse	23,311
2007	101.5	99.8–103.1	no different	42,045
2008	99.7	98.0–101.4	no different	42,644
2009	102.9	101.2–104.6	worse	43,646
2010	105.2	103.7–106.7	worse	63,774
2011	108.4	106.6–110.2	worse	50,026
2012	100.6	98.8–102.3	no different	56,639
2013	101.4	99.7–103.2	no different	58,145
2014	100.1	98.4–101.8	no different	66,349
2015	106.3	104.5–108.1	worse	69,223
2016	88.9	87.2–90.6	better	77,143
2017	80.8	79.0–82.7	better	62,396
2018	89.3	87.1–91.5	better	51,183
2019	108.0	105.5–110.6	worse	48,741
2020	109.3	104.9–113.7	worse	17,030

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 796,615 (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). Toyota Prius 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/toyota-prius/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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