2,615 tests in 2025
MG Gs reliability and MOT pass rate
78.7% passed first time. The 21.3% fail rate is 1.3 points better than the all-car average, on a median example 8 years old with 52,258 miles.
Pass rate
78.7%
22.6% of all cars failed; 21.3% of these did.
Fixed on the day
5.8%
Passed after a defect was put right during the visit.
Median at test
52,258 mi
8 years old.
Fail rate by age
| Age at test | Tests | Fail rate |
|---|---|---|
| 3-5 years | 0 | — |
| 6-9 years | 2,615 | 21.3% |
| 10-13 years | 0 | — |
| 14+ years | 0 | — |
What the Gs fails on
Share of failed tests with at least one fail item in each DVSA inspection section. A test can fail in several sections at once.
- Brakes107 dangerous35.5%
- Lamps, reflectors and electrical equipment1 dangerous34.8%
- Tyres143 dangerous31.7%
- Noise, emissions and leaks13.1%
- Seat belts and supplementary restraint systems12.7%
- Visibility11.1%
- Suspension10.8%
- Body, chassis, structure4 dangerous9.1%
Is the Gs getting worse?
The fail rate rose 9.8 points to 21.3% from 2022 to 2025 while the median one tested aged 3 years. Ageing alone would predict about 6.6 points, so it is getting worse faster than age explains.
| Year | Tests | Median age | Fail rate | All cars | |
|---|---|---|---|---|---|
| 2022 | 2,870 | 5 | 11.5% | 22.5% | |
| 2023 | 2,868 | 6 | 14.7% | 22.8% | |
| 2024 | 2,398 | 7 | 20.1% | 23.2% | |
| 2025 | 2,614 | 8 | 21.3% | 22.6% |
Fail rate is first attempts at class 4 tests. Median age is the age of a typical Gs at its test that year, and it is the number to watch: across the whole fleet each extra year of age adds roughly 1.9 points to the fail rate, so a model whose age and fail rate rise together is simply getting older.
The exact defects that fail it
Every failure item DVSA recorded against a Gs in 2025, counted by how many tests each one appeared on.
- 1Brake pads: less than 1.5 mm thick82 tests
- 2Anti-lock braking system: warning lamp indicates an ABS fault75 tests
- 3Tread depth: tread depth below requirements of 1.6mm67 tests
- 4SRS malfunction indicator lamp: warning lamp indicates a fault63 tests
- 5Headlamp aim: too low61 tests
- 6Tyre pressure monitoring system: malfunctioning or obviously inoperative60 tests
- 7Electronic stability control: warning lamp indicates a fault53 tests
- 8Coil spring: fractured or broken49 tests
What wears out first
Advisories are the tester flagging wear that is still legal. A typical Gs collects 2.53 of them per test, and these are the ones that come up most. Treat it as the running-repairs list for the next year or two.
- 1Brake discs: in such a condition that it is seriously weakened478 tests
- 2Condition: has a tear, caused by separation or partial failure of its structure444 tests
- 3Tread depth: tread depth below requirements of 1.6mm360 tests
- 4Brake pads: less than 1.5 mm thick270 tests
- 5Coil spring: corroded so that its cross sectional area is reduced and seriously weakened117 tests
- 6Non-component advisories: Child Seat fitted not allowing full inspection of adult belt97 tests
- 7Non-component advisories: Nail in tyre89 tests
- 8Sub-frame: corroded and seriously weakened78 tests
Questions
What is the MG Gs MOT pass rate?
78.7% of the 2,615 MG Gs first-attempt MOTs in 2025 passed. The fail rate of 21.3% compares with 22.6% across all cars. A further 5.8% passed after a defect was fixed during the test visit.
What does a MG Gs usually fail on?
The single most common failure is "Brake pads: less than 1.5 mm thick", recorded on 82 failed tests, followed by "Anti-lock braking system: warning lamp indicates an ABS fault" and "Tread depth: tread depth below requirements of 1.6mm". By section, brakes appears in 35.5% of failures, lamps, reflectors and electrical equipment appears in 34.8% of failures, tyres appears in 31.7% of failures.
Does age change the odds?
Sharply. At 3 to 5 years old the fail rate was n/a%; at 6-9 years it was 21.3%. The median MG Gs tested in 2025 was 8 years old with 52,258 miles.
Is the MG Gs getting less reliable?
The fail rate rose 9.8 points to 21.3% from 2022 to 2025 while the median one tested aged 3 years. Ageing alone would predict about 6.6 points, so it is getting worse faster than age explains.
First-attempt class 4 tests, 2025, from DVSA’s anonymised MOT data (OGL v3, retrieved 2026-09-12). DVSA records newer cars trim by trim; this page adds every Gs trim together. Year-on-year figures come from the same DVSA extracts for 2026 and earlier years. Full method on the pass rates hub.
Other MG models
Checking a particular Gs?
The odds above are the model. The car in front of you has its own record: every test, every advisory, the mileage at each one.
Due a test? Find an approved MOT station near you.