Mg 4 vs Mg Zs: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Mg 4
100%
MOT pass rate · 7 vehicles
Mg Zs
74%
MOT pass rate · 38,862 vehicles
Verdict: On MOT pass rate the Mg 4 (100%) and Mg Zs (74%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Mg 4 | Mg Zs |
|---|---|---|
| MOT pass rate | 100% ✓ | 74% |
| MOT failure rate | 0% ✓ | 26% |
| Faults & advisories per test | 0.8 ✓ | 1.8 |
| Dangerous-fault share | 0% ✓ | 1% |
| Average mileage | 26,285 mi | 71,653 mi |
| Sample size (vehicles) | 7 | 38,862 |
Most common faults
Mg 4
- Offside Rear Tyre has a cut but not deep enough to reach the ply or cords (5.2.3 (d) (i))
- Nearside Rear Service brake fluctuating, but not excessively (1.2.1 (e))
- Offside Rear Service brake fluctuating, but not excessively (1.2.1 (e))
- Rear Brake disc worn, pitted or scored, but not seriously weakened Both rears (1.1.14 (a) (ii))
- Rear Registration plate deteriorated but not likely to be misread (0.1 (b))
Mg Zs
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Parking brake: efficiency below requirements (3.7.B.7)
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Mg 4 (100%) and Mg Zs (74%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Mg 4 report Full Mg Zs report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.