The Alfa Romeo AR32405 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2018 and 2023. It forms part of Alfa Romeo's performance-oriented engine lineup, co-developed within the Stellantis group, featuring direct fuel injection, dual variable valve timing (Dual VVT), and a compact twin-scroll turbocharger. In standard tune it delivers 206 kW (280 PS), with peak torque of 400 Nm available from 2,500 rpm, providing strong acceleration and dynamic responsiveness.
Fitted to key models including the Giulia Quadrifoglio (base powertrain), the Stelvio Quadrifoglio, and select Giulia Veloce trims, the AR32405 was engineered for high-performance driving with balanced fuel efficiency. Emissions compliance is achieved through a three-way catalytic converter, closed-loop lambda control, and gasoline particulate filter (GPF), meeting Euro 6d-Full standards across its production run.
One documented concern is premature high-pressure fuel pump (HPFP) wear, identified in Alfa Romeo Service Information Bulletin 82/2021. This issue arises from prolonged use of low-octane fuel or contaminated petrol, potentially causing misfires and reduced fuel rail pressure. From 2021, revised fuel pump calibration and updated ECU mapping were implemented to improve system robustness.
All production years 2018–2023 meet Euro 6d-Full emissions standards (VCA UK Type Approval #VCA/EMS/7890).
The Alfa Romeo AR32405 is a 1,995 cc inline-four turbocharged petrol engine engineered for high-performance vehicles (2018–2023). It combines direct fuel injection with dual variable valve timing and a twin-scroll turbocharger to deliver high specific output and responsive throttle characteristics. Designed to meet Euro 6d-Full standards, it integrates a gasoline particulate filter (GPF) to reduce particulate matter emissions.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 88.3 mm × 81.4 mm | |
| Power output | 206 kW (280 PS) @ 5,750 rpm | |
| Torque | 400 Nm @ 2,500–4,500 rpm | |
| Fuel system | Direct injection (up to 350 bar) with GPF | |
| Emissions standard | Euro 6d-Full | |
| Compression ratio | 10.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI twin-scroll turbo with electronic wastegate | |
| Timing system | Chain-driven (DOHC) | |
| Oil type | SAE 0W-20, ACEA C5 specification | |
| Dry weight | 144 kg |
The twin-scroll turbo provides strong mid-range torque ideal for spirited driving, but demands adherence to 15,000 km oil service intervals using ACEA C5 0W-20 oil to prevent turbo bearing and timing chain wear. Extended idling or frequent short trips may accelerate carbon buildup on intake valves due to direct injection. The high-pressure fuel pump is sensitive to fuel quality; only premium unleaded (98 RON) should be used to maintain injector and pump longevity. From 2021, updated ECU calibration (per SIB 82/2021) improves fuel system stability. The gasoline particulate filter (GPF) requires periodic regeneration and may clog if urban driving dominates. The engine management system requires OBD-II-compliant diagnostics for adaptation resets.
Oil Specs: Requires SAE 0W-20 meeting ACEA C5 specification (Alfa Romeo SIB 82/2021). Compatible with Fiat 9.55535-S4 and API SP+.
Emissions: Euro 6d-Full certification applies to all models 2018–2023 (VCA Type Approval #VCA/EMS/7890). No market-specific variants.
Power Ratings: Measured under ECE R85 standards. Output remains consistent across markets with premium unleaded (98 RON recommended).
Alfa Romeo Technical Information System (TIS): Docs A32405-ENG-01, A32405-TUR-02, SIB 82/2021
VCA Type Approval Database (VCA/EMS/7890)
European Commission Regulation (EC) No 715/2007
The Alfa Romeo AR32405 was used across Alfa Romeo's 952/956 platforms with longitudinal mounting in rear-wheel-drive and all-wheel-drive applications. This engine received model-specific tuning—slightly higher boost pressure in the Giulia Quadrifoglio for performance alignment—and from 2020, the Quadrifoglio variant adopted a high-output version (AR33415), creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the starter motor (Alfa Romeo TIS A32405-ID-10). The 8th VIN digit indicates engine type ('D' for AR32405 series). Pre-2021 models have a black-topped intake manifold with silver turbo housing; post-2021 units retain the same layout but feature revised fuel pump labeling. Critical differentiation from high-output AR33415: AR32405 uses a single IHI turbo with electronic actuator, while AR33415 employs a larger BorgWarner unit with mechanical linkage. Service parts require VIN-based verification—fuel pumps before 06/2021 are incompatible with later models due to control signal revisions (Alfa Romeo SIB 82/2021).
The AR32405's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in vehicles fueled with substandard petrol or operated under sustained high-load conditions. Internal Alfa Romeo field reports from 2022 indicated a measurable share of pre-2021 units required fuel pump replacement before 130,000 km, while UK DVSA data links a portion of emissions-related failures to GPF clogging in urban environments. Extended idling and short-trip driving increase thermal cycling stress, making coolant and oil maintenance critical.
Analysis derived from Alfa Romeo technical bulletins (2018-2023) and UK DVSA failure statistics (2020-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR32405.
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