2017 Mg Gs — MOT failures & pass rate
Across 5,379 MOT tests analysed for the 2017 Mg Gs, the most common recorded failure areas were lighting & signalling, brakes and tyres. Its pass rate of 85.5% was below the average for cars of a similar age (87.5%). Higher-mileage examples failed more often — 24.1% in the 90-120k group versus 7.6% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 8.4% | 450 |
| 2 | Brakes | 5.6% | 303 |
| 3 | Tyres | 5.5% | 297 |
| 4 | Emissions & environmental | 2.4% | 127 |
| 5 | Visibility | 1.8% | 97 |
| 6 | Seat belts & restraints | 1.6% | 85 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 428 |
| 2 | Tread depth | 163 |
| 3 | Brake pads | 139 |
| 4 | Anti-lock braking system | 109 |
| 5 | Brake discs | 89 |
| 6 | Tyre pressure monitoring system | 89 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 25.6% | 1,375 |
| 2 | Brakes | 23.0% | 1,238 |
| 3 | Other defects | 8.1% | 433 |
| 4 | Suspension | 5.5% | 298 |
| 5 | Lighting & signalling | 4.0% | 216 |
| 6 | Visibility | 3.4% | 182 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 1,401 | 7.6% |
| 30-60k | 2,852 | 14.9% |
| 60-90k | 941 | 21.6% |
| 90-120k | 158 | 24.1% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,002 | 7.6% |
| 2022 | 1,076 | 13.2% |
| 2023 | 1,078 | 14.3% |
| 2024 | 1,105 | 17.9% |
| 2025 | 1,118 | 18.6% |
What to check before buying a 2017 Gs
Before buying a 2017 Mg Gs, focus on the areas it most often fails on. Lighting & signalling accounted for 8.4% of tests for this year.
- Lighting & signalling (8.4% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (5.6% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Tyres (5.5% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2017 Mg Gss pass their MOT?
85.5% of the 5,379 2017 Mg Gs MOT tests in this dataset passed — a 14.5% fail rate.
What is the most common MOT failure on a 2017 Mg Gs?
Lighting & signalling, recorded in 8.4% of tests, followed by brakes (5.6%).
Does the 2017 Gs get worse with mileage?
Its MOT fail rate rises from 7.6% in the 0-30k band to 24.1% in the 90-120k band.
Methodology & source. Based on 5,379 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.