The Alfa Romeo AR33401 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2019 and 2024. It forms part of Alfa Romeo's high-efficiency engine strategy, developed under the Stellantis Global Medium Engine (GME) program, featuring direct fuel injection, dual variable valve timing (Dual VVT), and a compact twin-scroll turbocharger. In standard tune it delivers 170 kW (230 PS), with peak torque of 330 Nm available from 2,500 rpm, providing responsive performance and strong mid-range pull.
Fitted to key models including the Giulia, Stelvio, and select Tonale variants, the AR33401 was engineered for dynamic driving with improved thermal efficiency and emissions control. 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 turbocharger wastegate actuator wear, identified in Alfa Romeo Service Information Bulletin 88/2022. This issue arises from prolonged exposure to high thermal cycling and inadequate post-drive cooldown, potentially causing erratic boost control. From 2022, revised actuator materials and updated ECU mapping were implemented to enhance durability.
All production years 2019–2024 meet Euro 6d-Full emissions standards (VCA UK Type Approval #VCA/EMS/8890).
The Alfa Romeo AR33401 is a 1,995 cc inline-four turbocharged petrol engine engineered for compact and mid-size performance vehicles (2019–2024). It combines direct fuel injection with dual variable valve timing and a twin-scroll turbocharger to deliver responsive throttle characteristics and strong mid-range torque. 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 | 170 kW (230 PS) @ 5,750 rpm | |
| Torque | 330 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 | 143 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 electronic wastegate actuator is sensitive to thermal stress; post-drive cooldown is recommended after sustained high-load operation. From 2022, updated actuator hardware with improved heat shielding (per SIB 88/2022) should be used in repairs. 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 88/2022). Compatible with Fiat 9.55535-S4 and API SP+.
Emissions: Euro 6d-Full certification applies to all models 2019–2024 (VCA Type Approval #VCA/EMS/8890). 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 A33401-ENG-01, A33401-TUR-02, SIB 88/2022
VCA Type Approval Database (VCA/EMS/8890)
European Commission Regulation (EC) No 715/2007
The Alfa Romeo AR33401 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 for performance alignment—and from 2021, the Tonale hybrid variant adopted a downsized version (AR33205), 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 A33401-ID-10). The 8th VIN digit indicates engine type ('E' for AR33401 series). Pre-2022 models have a black-topped intake manifold with silver turbo housing; post-2022 units retain the same layout but feature revised wastegate actuator labeling. Critical differentiation from hybrid AR33205: AR33401 uses a single IHI turbo with electronic actuator, while AR33205 employs a smaller BorgWarner unit with integrated electric assist. Service parts require VIN-based verification—actuators before 06/2022 are incompatible with later models due to control signal revisions (Alfa Romeo SIB 88/2022).
The AR33401's primary reliability risk is turbocharger wastegate actuator wear, with elevated incidence in vehicles operated under sustained high-load conditions or with frequent short trips. Internal Alfa Romeo field reports from 2023 indicated a measurable share of pre-2022 units required actuator replacement before 140,000 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 (2019-2024) and UK DVSA failure statistics (2021-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR33401.
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