The Alfa Romeo AR 06420 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2017 and 2023. It is part of Alfa Romeo's GME-T4 (Global Medium Engine - Transverse) family, designed for transverse front-wheel-drive platforms. Featuring direct fuel injection, twin-scroll turbocharging, and Dual VVT, it delivers 140 kW (190 PS) and peak torque of 330 Nm, primarily in Giulietta and 595-series vehicles.
Fitted to the 940 Giulietta facelift and 332 4C Spider (US market), the AR 06420 was engineered for responsive urban performance with improved emissions control. Emissions compliance is achieved through a three-way catalytic converter, closed-loop lambda control, and gasoline particulate filter (GPF), meeting Euro 6c standards for 2017–2019 builds and Euro 6d-TEMP from 2020 onward depending on market-specific OBD calibration.
One documented engineering update is the integration of a dual-mass flywheel with enhanced torsional damping, introduced in Alfa Romeo Technical Bulletin 63/2019. This revision addressed early reports of drivetrain vibration under partial load, improving NVH (Noise, Vibration, Harshness) characteristics. Later production engines (post-10/2019) feature this updated flywheel and recalibrated engine mounts per engineering change AR-TU-2019-04.
Production years 2017–2019 meet Euro 6c standards; 2020–2023 models comply with Euro 6d-TEMP (VCA UK Type Approval #VCA/EMS/5680).
The Alfa Romeo AR 06420 is a 1,995 cc inline-four turbocharged petrol engine engineered for transverse applications in compact and sports models (2017–2023). It combines direct fuel injection with twin-scroll turbocharging and Dual VVT to deliver responsive low-end torque and linear throttle response. Designed to meet Euro 6 emissions standards, it balances urban drivability with regulated efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (IHI twin-scroll) | |
| Bore × stroke | 88.3 mm × 81.4 mm | |
| Power output | 140 kW (190 PS) @ 5,750 rpm | |
| Torque | 330 Nm @ 2,250–4,500 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 6c (pre-2020); Euro 6d-TEMP (post-2020) | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI twin-scroll variable wastegate turbo | |
| Timing system | Chain-driven (double-row, front-mounted) | |
| Oil type | SAE 0W-30 (Alfa Romeo 9.55535-S2 M1) | |
| Dry weight | 136 kg |
The twin-scroll turbo provides strong low-end pull ideal for city driving but demands consistent use of 95 RON fuel to prevent knock and carbon accumulation. Alfa Romeo 9.55535-S2 M1 (0W-30) oil is essential due to its thermal stability and compatibility with the timing chain and turbo bearings. Extended idling should be avoided to reduce coking in the turbo actuator. The HDEV5 fuel system requires regular use of detergent-rich fuel meeting EN 228 to prevent injector fouling. Post-2020 models feature upgraded flywheels; pre-2020 units should be inspected per Technical Bulletin 63/2019. Gasoline particulate filter longevity depends on consistent lambda sensor function and avoidance of misfire conditions.
Oil Specs: Requires Alfa Romeo 9.55535-S2 M1 specification (0W-30) (Alfa Romeo SIB 63/2019). Supersedes ACEA A1/B1 and A5/B5.
Emissions: Euro 6c certification applies to 2017–2019 models only (VCA Type Approval #VCA/EMS/5680). Euro 6d-TEMP applies to 2020–2023 depending on market OBD calibration.
Power Ratings: Measured under SAE J1349 standards. 140 kW output requires 95 RON fuel quality and full thermal management (Alfa Romeo TIS Doc. AR-A26017).
Alfa Romeo Technical Information System (TIS): Docs AR-A24682, AR-A25144, SIB 63/2019
VCA Type Approval Database (VCA/EMS/5680)
SAE International: J1349 Engine Power Certification Standards
The Alfa Romeo AR 06420 was used across Alfa Romeo's 940/332 platforms with transverse mounting and shared with select Fiat Chrysler Automobiles models for North American applications. This engine received platform-specific adaptations-shorter intake manifolds in the Giulietta and revised exhaust routing in the 4C Spider-and from 2020 the facelifted Giulietta received the AR 06420.TU variant with updated dual-mass flywheel and ECU calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front cylinder block near the timing cover (Alfa Romeo TIS AR-A24892). The 8th VIN digit indicates engine family ('D' for AR 06420 series). Pre-2020 models have silver valve covers with black turbo housings; post-2020 units use black valve covers. Critical differentiation from AR 06420.TU: Original AR 06420 uses Bosch MED 17.3.6 ECU with rectangular diagnostic port, while AR 06420.TU uses MEDG17.7.2 with trapezoidal port. Service parts require production date verification - dual-mass flywheels for engines before 10/2019 are incompatible with later units due to internal damping revisions (Alfa Romeo TB 63/2019).
The AR 06420's primary reliability risk is dual-mass flywheel degradation on early builds, with elevated incidence in stop-start urban driving. Internal Alfa Romeo quality reports from 2020 indicated a notable share of pre-2020 engines requiring flywheel replacement before 90,000 km, while UK DVSA records link a portion of emissions-related MOT failures to GPF saturation in high-mileage units. Short-trip usage and poor fuel quality increase carbon and coking risks, making fuel grade and service adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2017-2021) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR06420.
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