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 Giul…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AR 11671 offers responsive performance and efficiency, but early models (2016-2017) had reliability concerns, particularly timing belt tensioner failures. Later revisions (post-2018) improved durability, so well-maintained examples can be robust. Regular servicing and using correct oil (0W-30 Fiat 9.55535-S2) are essential for longevity.
The most documented issues are timing belt tensioner wear, turbo actuator sticking, and intake valve carbon buildup. Coolant leaks from the thermostat housing are also frequent. These are confirmed in Alfa Romeo service bulletins and field reports.
This 1.8L turbo petrol engine was used in the Giulietta (955) and MiTo (940). It powered 2.0 Turbo 165 HP variants from 2016 to 2020. All models require Euro 6-compliant fuel and specific maintenance protocols.
Yes. The AR 11671 responds well to ECU remapping. Stage 1 tunes typically add +25-40 kW safely, as stock internals handle increased torque. Supporting mods like intercooler and exhaust upgrades improve reliability at higher outputs. Tuning should be performed by specialists familiar with FCA engine management.
In a Giulietta 2.0 Turbo, combined consumption is approximately 7.0 L/100 km (~40 mpg UK). Real-world figures vary: city driving may see 9–10 L/100 km, while highway runs can achieve 6.2 L/100 km (~45 mpg UK). Driving style significantly impacts efficiency.
Yes. The AR 11671 is an interference engine. If the timing belt fails or jumps, piston-to-valve contact is likely, resulting in severe internal damage. Adhering to maintenance schedules and addressing belt noise immediately is critical.
Alfa Romeo specifies a 0W-30 synthetic oil meeting Fiat 9.55535-S2 specification. This oil ensures proper turbo and valve train lubrication. Change intervals should not exceed 15,000 km or one year, whichever comes first, to maintain engine health.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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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.
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