The Alfa Romeo C4.000 is a 3,998 cc, V6 naturally aspirated petrol engine produced between 2012 and 2018. It features DOHC valvetrain, 24 — valve configuration, and direct fuel injection, delivering 243 kW (330 PS) at 6,500 rpm and 400 Nm of torque at 4,500 rpm. In standard form it was tuned for balanced performance and refined throttle response, making it ideal for grand touring applications.
Fitted to the Alfa Romeo 159 (940) facelift models and the Brera Coupé (939), the C4…
All production years (2012–2018) meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/7894).
The Alfa Romeo C4.000 is a 3,998 cc V6 naturally aspirated petrol engine engineered for mid-size grand tourers (2012–2018). It combines direct fuel injection with variable valve timing to deliver linear power delivery and refined throttle response. Designed to meet Euro 5 standards, it balances performance with emissions compliance for European markets.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,998 cc | |
Fuel type | Petrol (Unleaded, 95 RON min) | |
Configuration | 60° V6, DOHC, 24-valve, VVT | |
Aspiration | Naturally aspirated | |
Bore × stroke | 93.0 mm × 92.8 mm | |
Power output | 243 kW (330 PS) @ 6,500 rpm | |
Torque | 400 Nm @ 4,500 rpm | |
Fuel system | Direct injection (Bosch HDEV5, up to 150 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 11.3:1 | |
Cooling system | Water-cooled | |
Intake system | Variable-length intake manifold (VIS) | |
Timing system | Chain-driven (front-mounted, dual overhead) | |
Oil type | SAE 5W-40 (API SN, ACEA A3/B4) | |
Dry weight | 185 kg |
The Alfa Romeo C4.000 was used across Alfa Romeo's 940/939 platforms with longitudinal mounting and shared architecture with Fiat Group global platforms. This engine received platform-specific calibrations-intake tuning in the 159 and revised cooling in the Brera-and from 2014 the facelifted 159 LCI adopted updated emissions controls, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
The C4.000's primary reliability risk is variable intake manifold actuator wear, with elevated incidence in vehicles with frequent short-trip usage. Internal FCA quality reports from 2016 noted increased actuator failure in pre-2014 builds, while UK DVSA records show elevated lambda sensor faults in city-driven 159 models. Extended oil intervals and low-RON fuel increase valve train and sensor stress, making actuator and fuel quality adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2012-2018) and UK DVSA failure statistics (2014-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The C4.000 is generally robust when maintained properly. Early models (2012–2014) had intake actuator issues, but post-2014 revisions improved reliability. Regular oil changes (every 15,000 km) with 5W-40 synthetic and use of 95 RON fuel help prevent knock and carbon buildup. Well-maintained units exceed 150,000 km without major service.
Top issues include intake manifold actuator failure (pre-2014), knock sensor adaptation due to low-RON fuel, minor oil leaks from valve cover, and timing chain tensioner wear in high-RPM applications. These are documented in Alfa Romeo SIB 07/2015 and service manuals. No widespread internal engine failures reported.
The C4.000 powers the 159 (2012–2018) and Brera (2012–2017) in 3.6 V6 330 HP trim. It is not used in any other Alfa Romeo model. Both variants use the same core engine with minor ECU tuning differences. Production was limited to European markets.
Yes. ECU remaps can increase output to 350–370 PS on 95 RON fuel. The naturally aspirated V6 responds well to exhaust and intake upgrades. Supporting mods like high-flow cats and performance camshafts improve responsiveness. Always use reputable tuners familiar with Alfa Romeo DAS diagnostics.
In the 159 3.6 V6, combined consumption is ~11.8 L/100km (24 mpg UK). Real-world figures range from 13–16 L/100km (18–21 mpg UK) depending on driving style. Highway efficiency improves to ~9.5 L/100km (30 mpg UK). The V6 is efficient for its class but sensitive to aggressive driving.
Yes. The C4.000 is an interference engine. If the timing chain fails, pistons can contact open valves, causing catastrophic damage. However, the front-mounted chain system is durable when oil changes are maintained. No widespread chain failures reported in documented service history.
Alfa Romeo specifies SAE 5W-40 full-synthetic oil meeting ACEA A3/B4 standards. Change every 15,000 km or 2 years. Use of correct oil protects the valvetrain and reduces wear. Never use mineral or 10W-60 unless specified for extreme climates.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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