2021 Mg Zs Exclusive Ev — MOT failures & pass rate
Across 9,369 MOT tests analysed for the 2021 Mg Zs Exclusive Ev, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 91.1% was in line with the average for cars of a similar age (91.3%). Higher-mileage examples failed more often — 13.6% in the 90-120k group versus 6.2% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 4.3% | 406 |
| 2 | Lighting & signalling | 4.0% | 376 |
| 3 | Visibility | 1.8% | 170 |
| 4 | Suspension | 1.1% | 98 |
| 5 | Brakes | 0.8% | 78 |
| 6 | Steering | 0.6% | 56 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp | 313 |
| 2 | Headlamp aim | 139 |
| 3 | Wipers | 128 |
| 4 | Tread depth | 86 |
| 5 | Washers | 73 |
| 6 | Brake discs | 57 |
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 | 21.0% | 1,970 |
| 2 | Brakes | 10.4% | 975 |
| 3 | Other defects | 8.4% | 786 |
| 4 | Suspension | 4.7% | 444 |
| 5 | Visibility | 2.4% | 228 |
| 6 | Lighting & signalling | 1.2% | 113 |
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 | 5,639 | 6.2% |
| 30-60k | 3,333 | 12.8% |
| 60-90k | 322 | 14.9% |
| 90-120k | 59 | 13.6% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2022 | 72 | 1.4% |
| 2023 | 265 | 6.8% |
| 2024 | 4,457 | 7.8% |
| 2025 | 4,570 | 10.1% |
What to check before buying a 2021 Zs Exclusive Ev
Before buying a 2021 Mg Zs Exclusive Ev, focus on the areas it most often fails on. Tyres accounted for 4.3% of tests for this year.
- Tyres (4.3% 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 (4.0% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (1.8% 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 2021 Mg Zs Exclusive Evs pass their MOT?
91.1% of the 9,369 2021 Mg Zs Exclusive Ev MOT tests in this dataset passed — a 8.9% fail rate.
What is the most common MOT failure on a 2021 Mg Zs Exclusive Ev?
Tyres, recorded in 4.3% of tests, followed by lighting & signalling (4.0%).
Does the 2021 Zs Exclusive Ev get worse with mileage?
Its MOT fail rate rises from 6.2% in the 0-30k band to 13.6% in the 90-120k band.
Methodology & source. Based on 9,369 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.