Smart Roadster vs Smart Forfour: MOT reliability compared
Updated 05 September 2026.
25.6%
Smart Roadster MOT failure rate, 1.2 pts lower than Smart Forfour
Smart Roadster is the more reliable MOT performer: 25.6% of Smart Roadster MOTs fail versus 26.8% for Smart Forfour, a 1.2 point gap.
| Metric | Smart Roadster | Smart Forfour |
|---|---|---|
| MOT failure rate | 25.6% | 26.8% |
| Tests analysed | 77,228 | 74,542 |
| Most common failure | Lamps & electrical (41.7%) | Lamps & electrical (34.4%) |
Questions and answers
Which is more reliable, Smart Roadster or Smart Forfour?
Smart Roadster is the more reliable MOT performer: 25.6% of Smart Roadster MOTs fail versus 26.8% for Smart Forfour, a 1.2 point gap.
What is the MOT failure rate of the Smart Roadster?
25.6% of Smart Roadster MOT tests result in a failure, from 77,228 tests.
What is the MOT failure rate of the Smart Forfour?
26.8% of Smart Forfour MOT tests result in a failure, from 74,542 tests.