Alfa Romeo 1.9 JTS
The 1.9-litre JTS direct injection unit produces 160 hp and is adequate but not generous in the heavy 159. The JTS technology brings the usual direct injection issues: inlet valve carbonisation and fuel dilution into the oil. In the 159 noticeably less willing to rev than in the lighter 147 — the engine has to fight against 1,500 kg.
Lively Estate the Alfa Way
1.9 JTS in the Sportwagon — revvy enough for real driving pleasure, economical enough for everyday life. Alfa feeling with cargo space. A genuine compromise winner.
Engine Weaknesses 6
The higher-output 2.4 JTDm variants (200/210 hp) develop cylinder head cracks between intake and exhaust valves. Cause: operation at the thermal limit. Cooling system condition and DPF regeneration intervals are critical for longevity.
Symptoms: White smoke, dropping coolant level without oil-water mix, hard coolant hoses after engine shutdown
Direct injection (JTS) prevents fuel from cleaning the valves. Deposits form from around 80,000 km and lead to misfires and power loss.
Symptoms: Rough engine running, power loss, misfires
The 1.9 JTS has an inherently elevated oil consumption of up to 1 litre per 1,000 km, which at high mileages can damage the catalytic converter.
Symptoms: Elevated oil consumption, blue smoke under load
The dual-mass flywheel (DMF) of the 2.4 JTDm in the 939 (159, Brera, Spider) commonly wears between 150,000 and 200,000 km. LUK units show early failures. Dealer cost approximately 2,700 €. A failed DMF can damage the bell housing.
Symptoms: Vibrations and rumbling at idle and when pulling away, metallic judder during rev changes, poor clutch response
The direct injection of the 1.9 JTS does not spray fuel onto the intake valves, so residues from crankcase ventilation are not washed away. Carbon deposits cause misfires and power loss especially after a cold start.
Symptoms: Power loss, misfires after cold start, rough idle, engine warning light with lean mixture fault
The alternator overrunning pulley (freewheel) on the 2.4 JTDm wears from around 160,000–200,000 km. Typical symptom: whistling at 2,000 rpm. Total alternator failure can result in battery drain while driving.
Symptoms: Whistling/squealing at ~2,000 rpm, declining charge voltage, battery warning light illuminates
Vehicle Weaknesses 8
The front subframe (engine cradle), rear axle carrier and sills rust without adequate factory protection. Particularly on TI models, areas behind trim panels corrode unnoticed. Subframe replacement costs approximately 1,000 € plus fitment.
The M32 gearbox (fitted to 1.9 JTDM and 1.9 JTS) develops bearing noise from around 100,000–190,000 km. Gearbox overhaul without removal costs approximately 1,100 €. Conversion to the more robust F40 gearbox is possible.
On the 159 and Brera 939, multiple electronic components can fail simultaneously: windows, air conditioning, Bose audio, xenon, door control units. A faulty body computer is the frequent cause. Replacement 800–2,000 €.
Control arm bushes and joints on the 159 front axle wear noticeably. A visual inspection at the time of purchase is recommended. At the end of their service life, pronounced knocking is clearly audible. Plan for renewal every 100,000–150,000 km.
The steering rack on 159 models up to 2007 tends to leak with squeaking and clicking noises when turning. A revised steering rack was fitted from the 2008 model year. A leaking rack puts stress on the hydraulic power steering.
The 159 cooling system (especially the 2.4 JTD) tends to develop air pockets, especially after repairs. Several bleed points must be observed. Symptoms: coolant boils over, heating only works at higher revs.
The 159's air conditioning regularly loses refrigerant through stone chip damage to the condenser or leaking connections. Correct fill quantity is 550 g — frequently only 490 g is added. Leaks are only visible via UV tracer after several days.
The brake discs on the 159 (especially the Spider variant) rust heavily after just 4 days of standing. Grinding and juddering occur when pulling away. After approximately 10 km the braking feel normalises, but disc wear remains elevated.
Reports & Tests
Only around 58.5 percent of seven-year-old Alfa 159s pass their MOT at the first attempt — a noticeably worse result than comparable German rivals. Diesel engines in particular cause significant problems up to and including total engine failure. Brake discs and suspension wear above average.