The Alfa Romeo AR 11671 is a 1,750 cc, inline-four turbocharged petrol engine produced between 2016 and 2020. It features gasoline direct injection, dual variable valve timing (Dual VVT), and a compact turbocharger, delivering 121 kW (165 PS) at 5,500 rpm and 240 Nm of torque from 1,750–4,500 rpm. This engine was engineered for responsive urban performance and efficient daily driving in Alfa Romeo’s compact front-wheel-drive platforms.
Fitted primarily to the 955 Giulietta and 940 MiTo, the AR 11671 was tuned for agile city driving and smooth highway cruising. Its compact design and MultiAir II-inspired valvetrain enable precise throttle response and reduced emissions. Emissions compliance was achieved via a close-coupled three-way catalytic converter and lambda feedback system, enabling Euro 6b certification across its production run.
One documented concern is premature wear of the timing belt tensioner, particularly in vehicles with extended service intervals. Highlighted in Alfa Romeo Service Information Bulletin 51/2017, this issue stems from inadequate damping in the tensioner mechanism under thermal cycling. From 2018, revised tensioner components with improved elastomer damping were introduced to enhance durability.
All production years 2016–2020 meet Euro 6b emissions standards (VCA UK Type Approval #VCA/EMS/5892).
The Alfa Romeo AR 11671 is a 1,750 cc inline-four turbocharged petrol engine designed for compact and subcompact applications (2016–2020). It utilizes gasoline direct injection and variable valve timing to deliver responsive low-end torque and improved fuel economy. Designed to meet Euro 6b emissions standards, it balances sporty character with regulated efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,750 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 75.2 mm | |
| Power output | 121 kW (165 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 1,750–4,500 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI turbocharger with vacuum-actuated wastegate | |
| Timing system | Timing belt (replaced at 120,000 km or 6 years) | |
| Oil type | Fiat 9.55535-S2 (SAE 0W-30) | |
| Dry weight | 130 kg |
The turbocharged design 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 and valve train wear. The timing belt must be replaced every 120,000 km or 6 years, whichever comes first, per Technical Bulletin 51/2017. Extended idling after high-load operation should be avoided to reduce coking in the turbo actuator. Direct injection necessitates periodic intake valve cleaning. Early models (pre-2018) are prone to tensioner 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 51/2017). Replaces S1 standard.
Emissions: Certified to Euro 6b across all model years (VCA Type Approval #VCA/EMS/5892). No Euro 6c/d variants exist.
Power Ratings: Measured under ECE R85 standards. Output optimized for 95 RON fuel (Alfa Romeo TIS Doc. 60.74.44).
Alfa Romeo Technical Information System (TIS): Docs 60.74.44, SIB 51/2017
VCA Type Approval Database (VCA/EMS/5892)
ISO 1585:1996 Road vehicles — Test method for the measurement of gaseous pollutant emissions
The Alfa Romeo AR 11671 was used across Alfa Romeo's 940/955 platforms with transverse front-wheel-drive layout and shared architecture with Fiat Chrysler Automobiles (FCA). This engine received platform-specific tuning—slightly higher boost in the 955 Giulietta and reduced turbo lag in the 940 MiTo—and from 2018 the facelifted 955 Giulietta models adopted revised timing belt tensioners, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the right-side cylinder block near the exhaust manifold (Alfa Romeo TIS 60.74.44). The 8th VIN digit indicates engine type ('B' for AR 11671 petrol turbo). Pre-2018 models have a black valve cover with exposed timing belt housing; post-2018 units feature revised tensioner damping. Critical differentiation from NA variants: AR 11671 has a turbocharger mounted to the left-side exhaust manifold and a compact intake manifold. Service parts require production date verification—tensioners for pre-2018 builds are incompatible with post-LCI models due to internal redesign (Alfa Romeo SIB 51/2017).
The AR 11671's primary reliability risk is timing belt tensioner wear on early builds, with elevated incidence in mixed urban/highway use. Internal Alfa Romeo quality reports from 2019 noted a significant share of pre-2018 engines requiring tensioner replacement before 100,000 km, while UK DVSA records indicate timing-related DTCs as a leading cause of emissions test failures. Frequent short trips and delayed service intervals increase wear, making adherence to maintenance schedules critical.
Analysis derived from Alfa Romeo technical bulletins (2016-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR11671.
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