Mg B vs Mg Zs: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Mg B
78%
MOT pass rate · 32,932 vehicles
More reliable
Mg Zs
74%
MOT pass rate · 38,862 vehicles
Verdict: On MOT pass rate, the Mg B is the more reliable of the two — 78% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Mg B | Mg Zs |
|---|---|---|
| MOT pass rate | 78% ✓ | 74% |
| MOT failure rate | 22% ✓ | 26% |
| Faults & advisories per test | 1.4 ✓ | 1.8 |
| Dangerous-fault share | 1% | 1% |
| Average mileage | 52,356 mi | 71,653 mi |
| Sample size (vehicles) | 32,932 | 38,862 |
Most common faults
Mg B
- Oil leak
- Parking brake: efficiency below requirements (3.7.B.7)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Exhaust emissions carbon monoxide content excessive (7.3.B.1a)
- Oil leak, but not excessive (8.4.1 (a) (i))
- Horn not working (1.6.2a)
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 B is the more reliable of the two — 78% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Full Mg B 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.