Smart Fortwo (451) Problems by Year
The 451 generation moved to a 1.0L Mitsubishi-sourced engine (naturally aspirated or turbo). It is significantly more robust than the 450 but introduced its own unique issues, particularly with the MHD system.
Select a year below to see the specific problems affecting that model year, with estimated repair costs and severity ratings.
2
Year Periods
3
Known Issues
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Serious Faults
1
Moderate Issues
Select a Year Period
Browse Smart Fortwo (451) in our Directory
View MOT history, registration data, and reliability scores for the Smart Smart Fortwo (451).
View Smart Fortwo (451) DirectoryBuying Tips for the Smart Fortwo (451)
- ✓On MHD (Mild Hybrid Drive) models, check that the starter-generator belt and tensioner have been updated to the latest revision.
- ✓Test the air conditioning thoroughly; the pipes are prone to chafing and leaking refrigerant.
- ✓Look for evidence of "clutch teaching" or adaptation in the service history to ensure smooth shifts.