The Alfa Romeo AR 30143 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2019 and 2023. It features gasoline direct injection (GDI), dual overhead camshafts (DOHC), and a twin-scroll turbocharger, delivering 147 kW (200 PS) at 5,700 rpm and 320 Nm of torque from 1,900–4,500 rpm. This engine was engineered as the core petrol unit for Alfa Romeo’s compact and mid-size platforms, balancing performance and efficiency.
Fitted to the 952 Giulia and 956 Stelvio, the AR 30143 was tuned for dynamic responsiveness and everyday drivability. Its design emphasizes compactness, lightweight construction, and near 50:50 weight distribution in longitudinal applications. Emissions compliance was achieved via a close-coupled three-way catalytic converter and adaptive lambda control, enabling Euro 6d-TEMP certification across its production run.
One documented concern is premature wear of the high-pressure fuel pump drive mechanism, particularly in vehicles with frequent short trips. Highlighted in Alfa Romeo Service Information Bulletin 71/2020, this issue stems from inadequate lubrication in the cam follower system. From 2021, revised drive components with enhanced metallurgy were introduced to improve durability.
All production years 2019–2023 meet Euro 6d-TEMP emissions standards (VCA UK Type Approval #VCA/EMS/7143).
The Alfa Romeo AR 30143 is a 1,995 cc inline-four turbocharged petrol engine designed for premium compact and mid-size applications (2019–2023). It utilizes gasoline direct injection and a twin-scroll turbocharger to deliver strong low-end torque and responsive throttle characteristics. Designed to meet Euro 6d-TEMP emissions standards, it balances sporty performance with regulated efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 88.0 mm × 81.5 mm | |
| Power output | 147 kW (200 PS) @ 5,700 rpm | |
| Torque | 320 Nm @ 1,900–4,500 rpm | |
| Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI twin-scroll turbo with electronically controlled wastegate | |
| Timing system | Chain-driven (double-row primary, single-row secondary) | |
| Oil type | Fiat 9.55535-S2 (SAE 0W-30) | |
| Dry weight | 138 kg |
The twin-scroll turbo provides strong low-RPM torque ideal for city driving but requires strict adherence to 15,000 km oil change intervals using Fiat 9.55535-S2 (0W-30) oil to prevent turbo bearing and timing chain wear. Extended idling after high-load operation should be avoided to reduce coking in the turbo actuator. Direct injection necessitates periodic intake valve cleaning. The high-pressure fuel pump is sensitive to frequent cold starts; early models (pre-2021) are prone to drive wear; updated components mitigate this risk. Emissions systems require full operating temperature for accurate diagnostics.
Oil Specs: Requires Fiat 9.55535-S2 (0W-30) specification (Alfa Romeo SIB 71/2020). Critical for turbo and chain longevity.
Emissions: Certified to Euro 6d-TEMP across all model years (VCA Type Approval #VCA/EMS/7143). Compliant under WLTP testing.
Power Ratings: Measured under ECE R85 standards. Output optimized for 95 RON fuel (Alfa Romeo TIS Doc. 60.74.88).
Alfa Romeo Technical Information System (TIS): Docs 60.74.88, SIB 71/2020
VCA Type Approval Database (VCA/EMS/7143)
ISO 1585:1996 Road vehicles — Test method for the measurement of gaseous pollutant emissions
The Alfa Romeo AR 30143 was used across Alfa Romeo's 952/956 platforms with longitudinal rear-transverse mounting and shared architecture with Stellantis. This engine received platform-specific tuning—slightly revised cooling in the 956 Stelvio and enhanced throttle mapping in the 952 Giulia—and from 2021 the facelifted 952/956 models adopted revised high-pressure fuel pump drives, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, below the intake manifold (Alfa Romeo TIS 60.74.88). The 8th VIN digit indicates engine type ('B' for AR 30143 petrol turbo). Pre-2021 models have a black valve cover with exposed fuel pump drive; post-2021 units feature revised metallurgy. Critical differentiation from AR 16202: AR 30143 has a single-mass flywheel, lower compression ratio, and no dry-sump lubrication. Service parts require production date verification—fuel pump drives for pre-2021 builds are incompatible with post-LCI models due to internal redesign (Alfa Romeo SIB 71/2020).
The AR 30143's primary reliability risk is high-pressure fuel pump drive wear on early builds, with elevated incidence in urban use. Internal Alfa Romeo quality reports from 2022 noted a significant share of pre-2021 engines requiring pump replacement before 100,000 km, while UK DVSA records indicate fuel system DTCs as a leading cause of emissions test failures. Frequent short trips and delayed maintenance increase wear, making adherence to service intervals critical.
Analysis derived from Alfa Romeo technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR30143.
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