MG B vs MG 3: MOT reliability compared
Updated 05 September 2026.
18.6%
MG 3 MOT failure rate, 4.6 pts lower than MG B
MG 3 is the more reliable MOT performer: 18.6% of MG 3 MOTs fail versus 23.2% for MG B, a 4.6 point gap.
| Metric | MG B | MG 3 |
|---|---|---|
| MOT failure rate | 23.2% | 18.6% |
| Tests analysed | 341,344 | 170,040 |
| Most common failure | Lamps & electrical (40.9%) | Tyres (27.2%) |
Questions and answers
Which is more reliable, MG B or MG 3?
MG 3 is the more reliable MOT performer: 18.6% of MG 3 MOTs fail versus 23.2% for MG B, a 4.6 point gap.
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.
What is the MOT failure rate of the MG 3?
18.6% of MG 3 MOT tests result in a failure, from 170,040 tests.