MG Zr vs MG B: MOT reliability compared
Updated 05 September 2026.
23.2%
MG B MOT failure rate, 7.0 pts lower than MG Zr
MG B is the more reliable MOT performer: 23.2% of MG B MOTs fail versus 30.2% for MG Zr, a 7.0 point gap.
| Metric | MG Zr | MG B |
|---|---|---|
| MOT failure rate | 30.2% | 23.2% |
| Tests analysed | 654,579 | 341,344 |
| Most common failure | Lamps & electrical (38.5%) | Lamps & electrical (40.9%) |
Questions and answers
Which is more reliable, MG Zr or MG B?
MG B is the more reliable MOT performer: 23.2% of MG B MOTs fail versus 30.2% for MG Zr, a 7.0 point gap.
What is the MOT failure rate of the MG Zr?
30.2% of MG Zr MOT tests result in a failure, from 654,579 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.