Fiat 500 0.9 TwinAir 85bhp — Dual Mass Flywheel Failure (TwinAir only)
Unusually for a tiny petrol engine, the two-cylinder TwinAir requires a Dual Mass Flywheel to smooth out its intense vibrations. This DMF wears out surprisingly fast.
Severity
SevereDIY Difficulty
Hard
Est. Cost
£600–£800
OBD Codes
None
Flywheel
Typical layout and location for the Flywheel assembly.
Symptoms
- Severe vibration through the cabin at low RPM
- Clattering noise from the gearbox
- Shuddering when pulling away
Root Cause
The 2-cylinder engine produces massive torsional vibrations. The DMF works overtime and the internal springs fail much faster than on 4-cylinder cars.
How To Fix
- Replace DMF and clutch together.
- Do NOT fit a solid flywheel conversion — it will snap the gearbox input shaft on a TwinAir.
- Cost: Parts £400, Labour £300. Total: £600-800
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £240–£320 |
| Independent Garage | £600–£800 |
| Main Dealership | £960–£1280 |
Other Faults on This Variant
Timing Belt Failure (Short 36,000-Mile Interval)
CriticalThe 0.9 TwinAir engine has an unusually short timing belt interval of just 36,000 miles or 3 years. This is poorly publicised and many owners miss it. Belt failure destroys the engine.
TwinAir UniAir Module Failure
CriticalThe 0.9 TwinAir engine uses a complex electro-hydraulic 'UniAir' module to actuate the intake valves instead of a traditional camshaft. This module fails if oil changes are neglected.
Air Conditioning Condenser Leak (Stone Damage)
MinorThe air conditioning condenser is mounted at the very front of the cooling pack, making it highly susceptible to stone damage from the road, leading to refrigerant loss.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.