Ford Mustang 2020: MOT failure rate for its age

13.9% of 2,091 MOT tests of the Ford Mustang first registered in 2020 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 116.9 (95% CI 103.5–130.3; 100 = normal for this model at that age): the 2020 Ford Mustang fails more often than other build years of the same model at the same age. This is a rough estimate from a smaller sample.

Ford Mustang built in 2020 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	13.9	%	all ages tested	2019–2024	2091
Index against this model at the same age (95% CI 103.5–130.3)	116.9	index	100 = normal for this model at that age	2019–2024	2091
Rank among this model's 8 build years	7	of 8	1 = fails least for its age	2019–2024	2091
Tested in 2024	1066	tests	median 16,583 miles	2024	1066

Built 2020 against Ford Mustang normal for the age: first-time MOT failure share at each age, age 3: 13.7% vs 11.2%; age 4: 14.2% vs 12.5%. Axis from 0% to 20%. DVSA MOT bulk data, 2019–2024.

Check a 2020 Ford Mustang by registration · All Ford Mustang 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 2020 Ford Mustang fail at each age?

Cars built in 2020 were tested at ages 3 to 4 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.

Ford Mustang built 2020: 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	1,025	13.7	11.7–15.9	11.2	121.6
4	1,066	14.2	12.2–16.4	12.5	112.9

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,091 (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 2020 Ford Mustang?

The most common failure group on cars built in 2020 is tyres: 8.6 items per 100 first tests, against 6 across all build years of the Ford Mustang. These counts are not age-adjusted: cars built in 2020 were tested at ages 3 to 4.

Failure items per 100 first tests, Ford Mustang built 2020 against the Ford Mustang in all build years (2019–2024, not age-adjusted)
Failure group	Built 2020, per 100	All build years, per 100	Items
Tyres	8.6	6	192
Visibility	5.8	4.8	129
Brakes	4	8.2	88
Lamps, reflectors and electrical equipment	1.7	8.3	37

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,223 (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 2020 compare with the years around it?

Among the 8 published build years of the Ford Mustang, 2020 ranks 7 (1 = fails least for its age). 2019: index 117.8.

Ford Mustang build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2013	75.2	48.3–102.1	no different (rough estimate)	221
2014	94.0	71.0–117.0	no different (rough estimate)	394
2015	85.1	74.4–95.9	better (rough estimate)	1,742
2016	100.7	96.7–104.7	no different	15,714
2017	92.4	87.5–97.3	better	10,282
2018	105.2	99.4–111.0	no different	8,746
2019	117.8	108.0–127.6	worse (rough estimate)	3,654
2020	116.9	103.5–130.3	worse (rough estimate)	2,091

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 42,844 (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). Ford Mustang 2020 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/ford-mustang/2020/

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.

Ford Mustang 2020: MOT failure rate for its age

How does the 2020 Ford Mustang fail at each age?

What fails most on the 2020 Ford Mustang?

How does 2020 compare with the years around it?

How to cite this page

Related pages

Other pages for this model