Smart Fortwo (451) Problems by Year
The second-generation Smart Fortwo (Type 451) addressed many of the original's flaws, offering a slightly longer wheelbase for a marginally better ride and replacing the fragile Mercedes engines with much more robust 1.0-litre Mitsubishi units (both naturally aspirated and turbocharged). In the UK, it remains an exceptional urban commuter, offering decent reliability and incredibly low running costs. The automated manual gearbox is still somewhat slow but vastly improved over the 450. It is the sensible choice for city drivers who want the iconic Smart footprint but need dependable daily reliability.
Select a year below to see the specific problems affecting that model year, with estimated repair costs and severity ratings.
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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)
- ✓Check the automated manual gearbox for hesitation; while improved, the clutch actuator still requires periodic electronic adjustment and lubrication.
- ✓Listen for a rattling noise on startup from the 1.0-litre Mitsubishi engine, which can indicate timing chain wear on high-mileage examples.
- ✓Inspect the panoramic roof (if fitted) for crazing or cracking in the polycarbonate material.
- ✓Check the operation of the air conditioning; condenser failures are common due to stone damage at the front of the car.
- ✓Look for dampness in the boot area, as the rear window seals can leak over time.
- ✓Ensure the heater blower motor operates smoothly; they are prone to squeaking and failing, and replacement is awkward.