2021 Mg Zs Exclusive T-Gdi Auto — MOT failures & pass rate
Across 4,914 MOT tests analysed for the 2021 Mg Zs Exclusive T-Gdi Auto, the most common recorded failure areas were brakes, tyres and lighting & signalling. Its pass rate of 92.8% was above the average for cars of a similar age (91.2%). Higher-mileage examples failed more often — 12.2% in the 60-90k group versus 4.9% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Brakes | 3.0% | 147 |
| 2 | Tyres | 2.4% | 118 |
| 3 | Lighting & signalling | 2.2% | 106 |
| 4 | Visibility | 1.2% | 57 |
| 5 | Suspension | 1.0% | 51 |
| 6 | Emissions & environmental | 0.5% | 25 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Brake pads | 105 |
| 2 | Headlamp aim | 85 |
| 3 | Brake discs | 49 |
| 4 | Wipers | 34 |
| 5 | Washers | 34 |
| 6 | Tread depth | 28 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Brakes | 20.7% | 1,016 |
| 2 | Tyres | 12.7% | 624 |
| 3 | Other defects | 7.3% | 359 |
| 4 | Emissions & environmental | 3.8% | 185 |
| 5 | Suspension | 3.0% | 146 |
| 6 | Visibility | 1.9% | 92 |
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 | 2,999 | 4.9% |
| 30-60k | 1,659 | 10.8% |
| 60-90k | 246 | 12.2% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 98 | 3.1% |
| 2024 | 2,420 | 7.0% |
| 2025 | 2,380 | 7.7% |
What to check before buying a 2021 Zs Exclusive T-Gdi Auto
Before buying a 2021 Mg Zs Exclusive T-Gdi Auto, focus on the areas it most often fails on. Brakes accounted for 3.0% of tests for this year.
- Brakes (3.0% 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 (2.4% 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.
- Lighting & signalling (2.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
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 2021 Mg Zs Exclusive T-Gdi Autos pass their MOT?
92.8% of the 4,914 2021 Mg Zs Exclusive T-Gdi Auto MOT tests in this dataset passed — a 7.2% fail rate.
What is the most common MOT failure on a 2021 Mg Zs Exclusive T-Gdi Auto?
Brakes, recorded in 3.0% of tests, followed by tyres (2.4%).
Does the 2021 Zs Exclusive T-Gdi Auto get worse with mileage?
Its MOT fail rate rises from 4.9% in the 0-30k band to 12.2% in the 60-90k band.
Methodology & source. Based on 4,914 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.