The Alfa Romeo AR 01648 is a 1,750 cc, inline — four turbocharged petrol engine produced between 2007 and 2011. It formed the core of Alfa Romeo's performance — oriented petrol lineup during its era, featuring direct fuel injection, variable valve timing (VVT), and dual overhead camshafts. In standard tune it delivered 125 kW (170 PS), with peak torque of 240 Nm available from 2,000 rpm.
Fitted to models such as the 950 Spider, 940 MiTo, and 939 Giulietta, the AR 01648 was engin…
Production years 2007–2011 meet Euro 5 standards .
The Alfa Romeo AR 01648 is a 1,750 cc inline‑four turbocharged petrol engine engineered for compact and sporty applications (2007–2011). It combines direct fuel injection with variable valve timing to deliver sharp throttle response and mid-range punch. Designed to meet Euro 5 emissions standards, it balances engaging performance with acceptable fuel economy for its class.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,750 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 80.5 mm × 85.8 mm | |
Power output | 125 kW (170 PS) @ 5,500 rpm | |
Torque | 240 Nm @ 2,000–4,500 rpm | |
Fuel system | Direct injection (Bosch MED 17.3.3) | |
Emissions standard | Euro 5 | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single turbo (IHI VF37, variable vane) | |
Timing system | Chain-driven (integrated into cylinder head) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 138 kg |
The Alfa Romeo AR 01648 was used across Alfa Romeo's 939/940/950 platforms with transverse mounting and no licensed external applications. This engine received platform-specific adaptations-shorter intake manifolds in the MiTo and revised exhaust routing in the Spider-and from 2010 the facelifted Giulietta models adopted a revised turbocharger housing with improved cooling ducting, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 01648 offers engaging performance but requires disciplined maintenance. Early models (2007–2009) showed higher turbo failure rates under aggressive use. Later revisions (post-2010) improved thermal management. Regular oil changes with correct 5W-40 A3/B4 oil and cooldown periods after spirited driving significantly enhance longevity.
Key issues include turbocharger bearing wear, intake valve coking from direct injection, coolant leaks from the plastic thermostat housing, and oil seepage from the valve cover gasket. These are documented in Alfa Romeo service bulletins and supported by failure data from UK MOT records.
The AR 01648 was used in the MiTo (940), Giulietta (939), and Spider (950) models from 2007 to 2011. It powered the 1.8 Turbo variants across these lines, primarily in European markets. No cross-manufacturer applications are documented.
Aftermarket ECU tuning is common on the AR01648 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In real-world driving, expect 8.5–10.5 L/100km (27–33 mpg UK). The 1.8 Turbo in a Giulietta averages ~9.0 L/100km on mixed routes. Economy varies significantly with driving style—aggressive use can exceed 12 L/100km, while gentle driving may achieve 7.5 L/100km.
Yes, the AR 01648 is an interference engine. If the timing chain fails or skips, piston-to-valve contact will occur, resulting in severe internal damage. The chain is maintenance-free per OEM, but any unusual noise from the front of the engine warrants immediate inspection.
Alfa Romeo specifies SAE 5W-40 synthetic oil meeting ACEA A3/B4 standards. Use high-quality oil designed for turbocharged petrol engines and change it every 15,000 km or annually to protect the turbocharger and prevent sludge buildup in high-temperature areas.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.