MG GS 2018: MOT failure rate for its age

17.3% of 3,830 MOT tests of the MG GS 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 107.0 (95% CI 98.9–115.2; 100 = normal for this model at that age): the 2018 build year is no different from other years of the same model at the same age. This is a rough estimate from a smaller sample.

MG GS built in 2018 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	17.3	%	all ages tested	2019–2024	3830
Index against this model at the same age (95% CI 98.9–115.2)	107.0	index	100 = normal for this model at that age	2019–2024	3830
Rank among this model's 4 build years	3	of 4	1 = fails least for its age	2019–2024	3830
Tested in 2024	961	tests	median 41,141 miles	2024	961

Built 2018 against MG GS normal for the age: first-time MOT failure share at each age, age 3: 11.5% vs 10.7%; age 4: 12.8% vs 12.8%; age 5: 19.3% vs 19.1%; age 6: 25.3% vs 21.7%. Axis from 0% to 30%. DVSA MOT bulk data, 2019–2024.

Check a 2018 MG GS by registration · All MG GS 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 MG GS 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.

MG GS 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	934	11.5	9.6–13.7	10.7	107.1
4	960	12.8	10.8–15.1	12.8	99.8
5	975	19.3	16.9–21.9	19.1	101
6	961	25.3	22.6–28.1	21.7	116.7

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 3,830 (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 MG GS?

The most common failure group on cars built in 2018 is brakes: 6.8 items per 100 first tests, against 7.6 across all build years of the MG GS. These counts are not age-adjusted: cars built in 2018 were tested at ages 3 to 6.

Failure items per 100 first tests, MG GS built 2018 against the MG GS in all build years (2019–2024, not age-adjusted)
Failure group	Built 2018, per 100	All build years, per 100	Items
Brakes	6.8	7.6	262
Lamps, reflectors and electrical equipment	6	6.8	230
Tyres	4.8	5.9	185
Visibility	3.4	3.5	131
Seat belts and supplementary restraint systems	1.7	1.2	66

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 3,847 (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 MG GS, 2018 ranks 3 (1 = fails least for its age). 2017: index 103.4. 2019: index 134.3.

MG GS build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2016	95.6	88.2–103.1	no different (rough estimate)	3,402
2017	103.4	96.7–110.2	no different	4,975
2018	107.0	98.9–115.2	no different (rough estimate)	3,830
2019	134.3	116.4–152.2	worse (rough estimate)	1,148

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 13,355 (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). MG GS 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/mg-gs/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.

Other pages for this model

MG GS 2016 · MG GS 2017 · MG GS 2019 · MG GS by postcode area · MG GS body, chassis and structure failures · MG GS brakes failures · MG GS vehicle identification failures · MG GS lamps, reflectors and electrics failures · MG GS noise, emissions and leaks failures · MG GS seat belts and airbags failures · MG GS suspension failures · MG GS tyres failures · MG GS visibility failures