Swirl flaps / intake manifold
usually 100,000–180,000 km · High risk
Signs: Flap failure, engine light
Fix: Replace manifold
€400–900
Engine: common problems, timing drive and oil
2.4 JTD / JTDm (5-cyl)
Diesel · 2,387 cm³ · 100–154 kW
5
model generations
2
known faults
1,000
new cars in the EU (2010–2025)
Enter your VIN and mileage and get a plan built for your exact engine and gearbox.
Fuel: Diesel. Timing drive: belt · 120,000 km.
In our database this engine is fitted to 5 model generations, among them: Alfa Romeo Brera / Spider (939), Fiat Croma II, Alfa Romeo 159, Alfa Romeo 156, Alfa Romeo 166.
The most expensive known risk is EGR / DPF: it usually appears at 120,000–200,000 km and costs €300–1,500 to fix.
Key facts
| Fuel | Diesel |
|---|---|
| Displacement | 2,387 cm³ |
| Power | 100–154 kW |
| Timing drive | Belt · 120,000 km |
| Oil | 5W-40 · Fiat 9.55535-N2 · ~6.2 L · every 15,000 km |
| Engine codes | 839A6, 841C, 939A3, 939A9, 939B2, 185A6 |
Known engine faults
Faults that belong to the engine itself. They apply to every model with this engine, and each model has its own extra faults on its model page.
EGR / DPF
usually 120,000–200,000 km · Medium risk
Signs: Limp mode
Fix: Clean or replace
€300–1,500
Engine-related service
Intervals and typical prices, using the Alfa Romeo 159 as an example. The app gives the exact plan for your car.
| Item | Interval | Typical price |
|---|---|---|
| Engine oil + oil filterEngine | every 15,000 km or every 12 months | €70–150 |
| Air filterEngine | every 30,000 km or every 24 months | €15–45 |
| Fuel filterFuel | every 30,000 km or every 24 months | €40–110 |
| Glow plugsEngine | every 100,000 km | €120–300 |
| Auxiliary (serpentine) beltEngine | every 120,000 km | €70–180 |
| Timing belt kit + water pumpEngine | every 120,000 km or every 96 months | €450–900 |
| Coolant replacementCooling | every 150,000 km or every 96 months | €70–150 |
Models with this engine
Model generations this engine is fitted to.
Alfa Romeo 156 1997–2007Alfa Romeo 159 2005–2011Alfa Romeo 166 1998–2007Alfa Romeo Brera / Spider (939) 2005–2010Fiat Croma II 2005–2011
Common questions
Does the 2.4 JTD / JTDm (5-cyl) engine have a timing chain or a timing belt?
Belt · 120,000 km.
What oil does the 2.4 JTD / JTDm (5-cyl) engine take?
5W-40 · Fiat 9.55535-N2 · ~6.2 L · every 15,000 km.
What are the known problems with the 2.4 JTD / JTDm (5-cyl) engine?
The faults with the highest risk: swirl flaps / intake manifold (100,000–180,000 km, €400–900); EGR / DPF (120,000–200,000 km, €300–1,500).
Which cars have the 2.4 JTD / JTDm (5-cyl) engine?
Alfa Romeo Brera / Spider (939), Fiat Croma II, Alfa Romeo 159, Alfa Romeo 156, Alfa Romeo 166.
Sources and notes
Faults, intervals and prices are indicative and collected from public sources and owner experience; always rely on the service book and a qualified workshop. Test statistics: DVSA – Anonymised MOT tests and results, Open Government Licence v3.0. Dutch tests: RDW Open Data (CC0). Engine versions: EEA, monitoring of CO₂ emissions from new passenger cars (CC BY 4.0, DG CLIMA). Owner complaints: NHTSA ODI (public domain). Recalls: DVSA Vehicle Safety Branch Recalls Database, OGL v3.0. Brand and model names are trademarks of their owners and are used only to describe the vehicles.
Updated 08/10/2026