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30 September 2025 (updated) Alfa Romeo 159 engines
The Alfa Romeo 159 was launched in 2005 as the successor to the Alfa Romeo 156 and established itself as a stylish mid-size sedan with a sporty character. The Alfa Romeo 159 engines comprised a wide range of petrol and diesel powerplants, which were continuously developed over the production period from 2005 to 2011 and are known for both their performance and their characteristic problem areas.
Alfa Romeo 159 Generation I (2005-2011)
The only generation of the Alfa Romeo 159 was characterized by ambitious technical solutions and Italian temperament, but also brought with it typical Alfa Romeo weaknesses. Mileage expectations varied greatly depending on the engine type: while the robust JTD diesel engines could easily reach 250,000 to 350,000 kilometers with proper maintenance, the more complex petrol engines often required extensive repairs to the timing chain, camshaft phasers or direct injection between 150,000 and 200,000 kilometers. The absolute top engine of this generation was the 1.9 JTDm with 150 hp, which optimally combined reliability, economy and sufficient power. Major engine damage due to neglected maintenance or overheated engines was not uncommon with the powerful V6 petrol engines. Typical repair intervals for the petrol engines were between 120,000 and 180,000 kilometers for major work, while the diesels often only required costly interventions after 200,000 kilometers.
Alfa Romeo 159 petrol engines: Generation I (2005-2011)
The Alfa Romeo 159 petrol engine range started with the 1.8 TBi (Turbo Benzina iniezione) with 200 hp, which offered impressive performance thanks to direct injection and turbocharging. However, this engine suffered from frequent problems with the high-pressure pumps of the direct injection system and coking of the intake valves. The 1.8 TBi was later replaced by the 1750 TBi, also with 200 hp, which largely remedied these teething troubles. The top of the Alfa Romeo 159 engine range was formed by the V6 units: the 2.2 JTS (Jet Thrust Stoichiometric) with 185 hp was a naturally aspirated engine with variable valve timing, which sounded full of character but was prone to timing chain damage and excessive oil consumption. The absolute pinnacle was the 3.2 V6 JTS with 260 hp, a complex engine with variable intake manifold length and cam phasing, but considered one of the most problematic Alfa Romeo 159 engines - cooling system problems, timing chain damage and defective cam phasers made it a costly pleasure.
Alfa Romeo 159 diesel engines: Generation I (2005-2011)
The Alfa Romeo 159 diesels were dominated by the proven JTD (Jet Turbo Diesel) family, which was offered in various configuration levels. The entry-level model was the 1.9 JTDm with 120 hp, followed by the more popular 150 hp version of the same engine. These Alfa Romeo 159 JTDm engines proved to be the most reliable of the entire range, offering an excellent combination of economy (5.8-6.2 l/100km) and durability. More power was provided by the 2.4 JTDm with a choice of 200 or 210 hp, but it was more prone to problems with the turbocharger and common rail injection. The absolute top diesel was the rare 2.4 JTDm with 210 hp and all-wheel drive, which was mainly offered in the Sportwagon version. All Alfa Romeo 159 diesel engines had particulate filters and complied with the Euro 4 standard, later models from 2008 even complied with Euro 5.
| Alfa Romeo 159 engine | Power output | Fuel consumption | Typical weaknesses | Rating |
|---|---|---|---|---|
| 1.8 TBi | 200 HP | 8.2-9.1 l/100km | Direct injection, valve coking | Moderate |
| 1750 TBi | 200 HP | 7.8-8.5 l/100km | Occasional turbocharger damage | Good |
| 2.2 JTS | 185 HP | 8.9-9.8 l/100km | Timing chain, oil consumption | Problematic |
| 3.2 V6 JTS | 260 HP | 10.5-12.1 l/100km | Cooling, timing chain, camshafts | Problematic |
| 1.9 JTDm | 120-150 HP | 5.8-6.2 l/100km | Very robust and economical | Very good |
| 2.4 JTDm | 200-210 HP | 6.4-7.1 l/100km | Turbocharged, fuel injection | Average |
Conclusion: The best Alfa Romeo 159 engines
The Alfa Romeo 159 engines reflected typical Italian engineering - brilliant concepts with characteristic weaknesses. While the diesel engines impressed with their reliability and efficiency, the ambitious petrol engines struggled with complex technology and the resulting problems. The 2008 facelift brought improvements to the most critical points, but could not completely eliminate all teething troubles.
- Best Alfa Romeo 159 gasoline engine:
The 1750 TBi with 200 hp offered the best combination of performance, character and relative reliability among the gasoline engines.
- Best Alfa Romeo 159 diesel engine:
The 1.9 JTDm with 150 hp proved to be the most reliable and economical engine of the entire range with excellent long-term durability.
- Best overall Alfa Romeo 159 engine:
The 1.9 JTDm with 150 hp optimally combined reliability, economy and sufficient power and is considered the most sensible choice for prospective Alfa Romeo 159 buyers.
For maintenance and spare parts for the Alfa Romeo 159, AUTODOC offers a comprehensive range of original and quality spare parts with fast delivery, which is particularly valuable for the more maintenance-intensive engines in this series.
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