The Alfa Romeo AR 01646 is a 1,995 cc, inline‑four petrol engine produced between 2007 and 2011. It was engineered as a high — revving, naturally aspirated powerplant for Alfa Romeo's compact and mid — size platforms, featuring dual overhead camshafts (DOHC), variable valve timing (VVT), and multi — point fuel injection. In standard tune it delivered 110 kW (150 PS), with peak torque of 190 Nm available at 3,500 rpm.
Fitted to models such as the 159, GT, and Brera, the AR 01646 w…
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Alfa Romeo AR 01646 is a 1,995 cc inline‑four petrol engine engineered for compact and sporty applications (2007–2011). It combines dual overhead camshafts with variable valve timing to deliver high-RPM responsiveness and driver engagement. Designed to meet Euro 4 emissions standards, it balances spirited performance with acceptable fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 110 kW (150 PS) @ 6,400 rpm | |
Torque | 190 Nm @ 3,500 rpm | |
Fuel system | Multi-point fuel injection (MPI) | |
Emissions standard | Euro 4 | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing chain (front-mounted) | |
Oil type | SAE 5W-40, ACEA A3/B4 | |
Dry weight | 138 kg |
The Alfa Romeo AR 01646 was used across Alfa Romeo's 939/952 platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake manifolds in the GT and revised exhaust routing in the Brera-and from 2009 received updated camshafts to address wear concerns, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The AR 01646's primary reliability risk is premature camshaft wear on early builds, with elevated incidence in high-RPM usage. Internal Alfa Romeo quality reports from 2010 indicated a significant number of pre-2009 engines requiring camshaft replacement before 150,000 km, while VCA data shows increased catalytic converter failures in poorly maintained units. Extended high-speed operation and delayed oil changes increase wear rates, making oil quality and interval adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2008–2012) and UK DVSA failure statistics (2012–2020). 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 01646 offers engaging performance but early models (2007–2008) are prone to camshaft wear under high-RPM use. Later revisions (post-2009) significantly improved durability. Regular oil changes with correct 5W-40 A3/B4 oil and inspection of camshafts on high-mileage pre-2009 engines are essential for long-term reliability.
Key issues include premature camshaft wear (especially pre-2009), intake valve carbon buildup due to port injection, coolant leaks from the plastic thermostat housing, and ignition coil failures. These are documented in Alfa Romeo service bulletins and technical forums.
This 1.8L petrol engine was used in the Alfa Romeo 159 (2007–2011), GT (2007–2010), and Brera (2007–2010) as the 1.8 JTS variant. It was not used outside the Alfa Romeo brand and is specific to transverse-mounted applications in these models.
Limited tuning potential exists. ECU remaps can yield +10–15 kW by optimizing ignition and fuel maps, but gains are modest due to naturally aspirated design. Intake and exhaust upgrades offer minor improvements. Over-revving should be avoided, especially on pre-2009 engines with original camshafts.
Moderate. In a 159 1.8 JTS, combined consumption is approximately 7.8 L/100km (36 mpg UK). City driving can exceed 9.0 L/100km, while highway cruising achieves around 6.5 L/100km (43 mpg UK). Real-world figures depend heavily on driving style due to the engine's high-RPM character.
Yes. The AR 01646 is an interference engine. If the timing chain fails or jumps, piston-to-valve contact will occur, resulting in severe internal engine damage. Regular inspection of the timing chain and guides is strongly recommended, especially on high-mileage vehicles.
Alfa Romeo specifies SAE 5W-40 synthetic oil meeting ACEA A3/B4 standards. Oil must be changed every 15,000 km or annually to ensure proper lubrication of the camshafts and prevent premature wear. Using incorrect oil can accelerate camshaft degradation.
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
Type-approval guidance and documentation.
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