H4B (SCe 1.0)
Smart · 1.0 NA
2014–present
"Renault H4B in a Smart box. Slow but honest. Simple 3-cyl, no turbo drama. Perfect city runabout."
Mileage Risk Timeline
When problems typically appear — enter your mileage to see your risk zone
Known Issues 3
Thermostat failure
▸Temperature fluctuation, slow warm-up, CEL
Electronic thermostat sticks. Common Renault trait. Easy replacement.
Ηλεκτρονικός θερμοστάτης κολλάει. Κοινό θέμα Renault. Εύκολη αντικατάσταση.
Ignition coil failure
▸Misfire, rough idle, CEL
3-cylinder = each coil failure very noticeable. Keep spare coil in glovebox.
3-κύλινδρος = κάθε βλάβη πολύ αισθητή. Κρατήστε ανταλλακτικό πολύ.
Engine mount vibration
▸Excessive vibration at idle, clunk on acceleration
Rear-mounted 3-cyl vibrates. Mounts wear faster than expected. Replace in pairs.
Πίσω τοποθετημένος 3-κύλινδρος δονείται. Βάσεις φθείρονται γρηγορότερα. Αντικατάσταση σε ζεύγη.
Models with H4B (SCe 1.0) 3
Other Smart Engines
Tuning Potential
None practical
Frequently Asked Questions
Is the Smart H4B (SCe 1.0) reliable?
The Smart H4B (SCe 1.0) scores 72/100 with a verdict of ACCEPTABLE. It has 3 documented issues with total repair costs between €450 and €1,150.
What are the common problems with the H4B (SCe 1.0)?
The most common issues are:
- Thermostat failure — moderate, repair cost €200–€450, 50,000 km–100,000 km
- Ignition coil failure — minor, repair cost €100–€300, 40,000 km–80,000 km
- Engine mount vibration — minor, repair cost €150–€400, 60,000 km–120,000 km
What cars use the Smart H4B (SCe 1.0)?
The H4B (SCe 1.0) is found in:
- ForFour 1.0 (2014–present)
- ForTwo 1.0 (2014–present)
- ForTwo Cabrio (2016–present)
How much does it cost to repair the H4B (SCe 1.0)?
Total potential repair costs for all 3 known issues range from €450 to €1,150. The most expensive issue is typically .
What years was the H4B (SCe 1.0) produced?
The Smart H4B (SCe 1.0) was produced from 2014 to present. It is a 999cc I3 petrol na engine.
Scores are calculated from documented issues, repair costs, and failure patterns across thousands of owner reports and technical sources. Learn about our methodology. Always inspect before you buy.