2020 Mg Zs Exclusive Ev — MOT failures & pass rate
Across 16,265 MOT tests analysed for the 2020 Mg Zs Exclusive Ev, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 91.2% was in line with the average for cars of a similar age (90.6%). Higher-mileage examples failed more often — 13.5% in the 150k+ group versus 5.0% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 5.0% | 809 |
| 2 | Lighting & signalling | 4.2% | 676 |
| 3 | Visibility | 1.5% | 242 |
| 4 | Brakes | 1.4% | 223 |
| 5 | Suspension | 0.7% | 107 |
| 6 | Steering | 0.5% | 75 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp | 555 |
| 2 | Headlamp aim | 247 |
| 3 | Tread depth | 236 |
| 4 | Brake discs | 171 |
| 5 | Wipers | 166 |
| 6 | Brake pads | 110 |
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 | 21.5% | 3,497 |
| 2 | Brakes | 13.2% | 2,146 |
| 3 | Other defects | 7.5% | 1,215 |
| 4 | Suspension | 4.4% | 719 |
| 5 | Visibility | 2.1% | 346 |
| 6 | Lighting & signalling | 1.1% | 185 |
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 | 8,295 | 5.0% |
| 30-60k | 6,618 | 12.5% |
| 60-90k | 1,021 | 15.2% |
| 90-120k | 228 | 14.5% |
| 120-150k | 66 | 10.6% |
| 150k+ | 37 | 13.5% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 160 | 1.9% |
| 2022 | 386 | 4.7% |
| 2023 | 5,086 | 6.5% |
| 2024 | 5,234 | 8.8% |
| 2025 | 5,399 | 11.5% |
What to check before buying a 2020 Zs Exclusive Ev
Before buying a 2020 Mg Zs Exclusive Ev, focus on the areas it most often fails on. Tyres accounted for 5.0% of tests for this year.
- Tyres (5.0% 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 (4.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (1.5% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£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 2020 Mg Zs Exclusive Evs pass their MOT?
91.2% of the 16,265 2020 Mg Zs Exclusive Ev MOT tests in this dataset passed — a 8.8% fail rate.
What is the most common MOT failure on a 2020 Mg Zs Exclusive Ev?
Tyres, recorded in 5.0% of tests, followed by lighting & signalling (4.2%).
Does the 2020 Zs Exclusive Ev get worse with mileage?
Its MOT fail rate rises from 5.0% in the 0-30k band to 13.5% in the 150k+ band.
Methodology & source. Based on 16,265 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.