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…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AR33401 delivers responsive performance and strong mid-range torque, but pre-2022 models have a known risk of turbo wastegate actuator failure. Later revisions (post-2022) incorporated improved heat shielding and control calibration, enhancing durability. When maintained with correct oil (0W-20 ACEA C5) and regular coolant changes, these engines can reliably exceed 180,000 km.
The most documented issues are turbo wastegate actuator wear, intake valve carbon buildup due to direct injection, GPF clogging in city-driven vehicles, and oil leaks from the valve cover gasket. These are supported by Alfa Romeo service bulletins and field reports. Lambda sensor degradation and PCV system clogging are also observed in high-mileage units.
This 2.0L turbo petrol engine was used in the Giulia (2019–2024), Stelvio (2020–2024), and Tonale (2022–2024) trims. It is distinct from the hybrid AR33205 used in electrified variants. All variants meet Euro 6d-Full emissions standards.
Yes, the AR33401 responds well to ECU remapping. Stage 1 tunes typically yield +30–50 kW safely, as the stock turbo and internals handle increased boost. Enthusiasts often pair tuning with an upgraded intercooler and exhaust for better thermal management. Tuning should be performed by specialists familiar with Alfa Romeo's engine management system.
In real-world driving, expect 9.8–12.8 L/100km (22–29 mpg UK) depending on model and driving style. The Giulia achieves approximately 8.5 L/100km (33 mpg UK) on highways. Aggressive driving reduces efficiency significantly due to turbo boost demand. Using premium unleaded (98 RON) may improve responsiveness but has minimal impact on consumption.
Yes. The AR33401 is an interference engine, meaning piston-to-valve contact will occur if the timing chain fails or jumps. This can result in severe internal damage. While the chain is designed for the engine's lifetime, any signs of timing noise or oil starvation must be investigated immediately to prevent catastrophic failure.
Alfa Romeo specifies SAE 0W-20 synthetic oil meeting ACEA C5 standards. This low-SAPS formulation protects turbo bearings, timing chain, and the gasoline particulate filter (GPF). Oil changes should be performed every 15,000 km or annually. Using incorrect oil can accelerate turbo wear and contribute to GPF clogging.
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
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