Alfa Romeo 3.2 V6 Q4
The Busso V6's final appearance in an Alfa Romeo — 3.2 litres with JTS direct injection, 260 hp in the 159 and Brera. Same 60-degree bank angle and DOHC 24V architecture as the legendary 932A.000, but with modern fuelling. The sound remains the multi-voiced Busso howl from 5,000 rpm, the power delivery slightly fuller in the mid-range than in the pure naturally aspirated GTA units. In the 159 noticeably heavier than in the 147/156 — the extra weight costs agility but brings long-distance comfort. Q4 all-wheel drive in the Brera distributes the 300 Nm better but filters out the rear-axle character. Timing chains (three chains), no belt. 10W-60 oil remains mandatory.
Brera V6 Q4 — Giugiaro Coupe with All-Wheel Drive
The Brera with 3.2-litre V6 and Q4 all-wheel drive is Alfa's most beautiful coupe of the 2000s — Giugiaro's lines are timeless, the Busso V6 provides the fitting soundtrack. The Q4 all-wheel drive distributes power permanently to all four wheels and makes the Brera more manageable in the wet than the front-drive GTA models. The trade-off is the loss of rear-first dynamics: the Brera understeers benignly rather than oversteering wildly. At 1,630 kg too heavy for a true sports car, but as a grand tourer on long distances absolutely right.
Engine Weaknesses 5
Timing chain wear is a known issue on the 3.2 V6 JTS of the 159/Brera. Cold-start rattling is a warning sign. Repair is expensive and parts availability is poor.
Symptoms: Metallic rattling on cold start that diminishes after warm-up
The direct injection of the 3.2 V6 JTS prevents self-cleaning of the intake valves. Carbon deposits form especially during short-trip driving.
Symptoms: Power loss, rough running, misfires
The swirl flap system of the 1.9 JTDm shows the same weakness as all JTDm derivatives. EGR coking and bush wear on the actuator linkage. Flap breakage into a cylinder is possible. Blanking kit as permanent solution.
Symptoms: Engine warning light P2279/P2075, power loss, stumbling in the lower rev range
The EGR cooler corrodes and allows coolant into the exhaust duct. Identical problem across all 939 1.9 JTDm variants. Misdiagnosis as head gasket failure is common. Bypassing the EGR as a diagnostic test is an option.
Symptoms: White smoke after cold start, coolant loss, no oil-water mix
The glow plug relay and signal cable to the glow plug control unit fail. The relay is compatible with all JTD/JTDm engines on the 939 platform (part no. 51888255). Replacement costs 50–300 € in parts plus labour.
Symptoms: 'Pre-heating system unavailable' on the display, difficult cold starts, extended pre-glow time
Vehicle Weaknesses 10
Front and rear subframes rust without adequate corrosion protection. Rust on front wings and sills is an exclusion criterion when buying. Front and rear subframes can show significant rust that is expensive to repair.
Front and rear subframes rust through due to inadequate factory underbody sealing. The plastic undertray traps moisture. After 6–10 years structural corrosion is often found on the subframes and ECU brackets.
The steering rack on early Brera models (up to 2007) leaks and produces knocking and squealing noises. Front upper and lower wishbone joints wear early and announce themselves with creaking. Revised from the 2008 model year.
The 939 Spider boot takes on water after prolonged rain. A leaking hood compartment seal and porous rear seals allow ingress. Boot wiring loom can be damaged by moisture.
On the Brera 939 the air conditioning compressor develops a loud circular-saw noise from the engine bay when the compressor bearing wears. Refrigerant leaks accelerate bearing wear. Compressor replacement including system flush for metal swarf is required: 600–1,200 €.
On the Brera 939 rear springs can break, especially on vehicles driven heavily on poor roads. In addition, front upper and lower wishbones wear. Broken springs are a safety hazard and result in immediate MOT failure.
The Brera's tail lights take on moisture, leading to short circuits and bulb failure. Expensive to replace at approximately 450 € per unit. Checking the seals when buying a used example is advisable.
Rear lights on the 939 Spider draw in moisture through hairline cracks in the seal between the outer lens and housing. Condensation collects inside the light unit and causes corrosion of the sockets and short circuits.
The electric seat adjustment on the Brera 939 fails. The seat adjustment motor or drive mechanism wears out. Spare parts are hard to find for this discontinued model. Repair by specialists or used parts is recommended.
The brake discs on the Brera 939 (especially rarely driven examples) rust quickly and develop deep scoring from embedded rust. Ventilated sport discs rust particularly badly on their flanks. Typical on used cars with low usage.
Reports & Tests
The Brera shares its platform and many weak points with the 159. Rust on the front crossmember due to dirt accumulation between the seal and the component is a known issue, as are electrical failures and steering rack leaks on early build years up to 2007.