Alfa Romeo 1.9 JTD 16V
The 1.9-litre JTD 16V with 150 hp is the stronger version of Alfa's diesel — 16 valves instead of 8 deliver more power and a slightly more refined character. 305 Nm of torque make it a capable daily driver. Turbo and injectors are wear items at high mileage. DPF regeneration is problematic with mainly short-trip use. For long-distance and motorway driving, the most sensible Alfa diesel of its era.
Powerful diesel in the estate
As a Sportwagon, the 140 hp diesel does a solid job. Strong pull for everyday use, but the Alfa feeling stays in the background compared to the petrol engines.
Engine Weaknesses 5
The rubber O-ring on the oil pump suction pipe loses its elasticity from around 80,000 km, allowing air into the pump. Initially only noticeable on cold starts; in extreme cases an oil pressure drop can lead to engine damage.
Symptoms: Oil pressure warning shortly after start, faint ticking on cold start, rarely engine warning light
The VTG turbocharger clogs up with soot and rust. The adjustment ring jams, leading to power loss and unstable boost pressure.
Symptoms: Power loss, fluctuating boost pressure, engine warning light
The gasket between the vacuum pump and cylinder head as well as the square O-ring on the pump housing begin to leak over time. Oil drops on the manifold cause smoke and an unpleasant smell inside the cabin.
Symptoms: Oil smell in the cabin, blue oily smoke after switching off, visible oil traces on the cylinder head
The plastic cover of the EGR heat exchanger behind the cylinder head cracks or no longer seals properly. Coolant loss and overheating risk are possible consequences; replacing the gasket set is labour-intensive.
Symptoms: Slow coolant loss, coolant smell in the engine bay, sporadic overtemperature warning light
The EGR valve carbons up regularly during short-trip use. Causes power loss and fault codes.
Symptoms: Power loss, limp mode, engine warning light
Vehicle Weaknesses 11
The rear spring perch rusts through at the weld seams, which can lead to complete failure of the spring seat. The spring perch can drop onto the tyre and destroy it. Safety-critical — regular visual inspection in the wheel arch is necessary.
Footwell floor and sills rust from the inside outwards. Rust is often concealed by carpet or sill trim covers. Jacking points on the underbody are also heavily affected. Lift the carpet on purchase inspection.
The rear trailing arm rusts through at load-bearing points, affecting wheel alignment. The rear axle body and subframe were fitted without adequate corrosion protection. Safety-critical with advanced rust.
Sill edges, wheel arch transitions, jacking points and underbody rust heavily. Underbody protection peels off early. Internal rust inspection through the ventilation duct in the rear area is recommended.
The water pump typically wears between 120,000 and 175,000 km and should be renewed at the timing belt change. A known silent recall concerns a leaking sealing plug on the coolant pipe. Cost: 350–550 €.
The ABS sensors on the 156 are inadequately protected against water spray. Moisture causes them to fail frequently, activating the ABS warning light.
Upper and lower front control arms reliably wear from 100,000 km. Original parts are sometimes hard to source. Knocking when driving over bumps is the typical sign.
The shared control unit for window regulators, central locking and interior lighting fails regularly. Windows do not respond, central locking is blocked. A fuse reset (pulling the fuse for 10 minutes) is often sufficient. Replacement cost: 50–200 €.
The air conditioning no longer cools as the compressor or its magnetic clutch has failed. Refrigerant is frequently lost through leaking hose connections. Compressor replacement costs 500–900 €, a simple air conditioning service 60–100 €.
The brake discs on the 156 tend to warp and rust heavily, especially after periods of standing. Steering wheel vibrates during braking. Early replacement necessary; repair costs 200–400 € per axle.
The 156 dashboard cracks and deforms with direct sunlight. Seats show early upholstery wear. A typical problem on vehicles from around 100,000 km or after 10 years.
Reports & Tests
The 156 prioritises design and driving dynamics at the expense of long-term durability. Rust sets in noticeably earlier than the class average, and in its eleventh year of operation the corrosion level is considerably above the mean. Diesel engines are prone to turbocharger damage, petrol engines to timing belt failures.