MG Zs vs MG B: MOT reliability compared
Updated 05 September 2026.
22.7%
MG Zs MOT failure rate, 0.5 pts lower than MG B
MG Zs is the more reliable MOT performer: 22.7% of MG Zs MOTs fail versus 23.2% for MG B, a 0.5 point gap.
| Metric | MG Zs | MG B |
|---|---|---|
| MOT failure rate | 22.7% | 23.2% |
| Tests analysed | 506,307 | 341,344 |
| Most common failure | Brakes (33.3%) | Lamps & electrical (40.9%) |
Questions and answers
Which is more reliable, MG Zs or MG B?
MG Zs is the more reliable MOT performer: 22.7% of MG Zs MOTs fail versus 23.2% for MG B, a 0.5 point gap.
What is the MOT failure rate of the MG Zs?
22.7% of MG Zs MOT tests result in a failure, from 506,307 tests.
What is the MOT failure rate of the MG B?
23.2% of MG B MOT tests result in a failure, from 341,344 tests.