The Alfa Romeo AR 06124 is a 1,970 cc, inline-four petrol engine produced between 2003 and 2006. It was developed as a high-revving, naturally aspirated powerplant for Alfa Romeo's compact and sporty platforms, featuring dual overhead camshafts (DOHC), variable valve timing (VVT), and multi-point fuel injection. In standard tune it delivered 100 kW (136 PS), with peak torque of 180 Nm available at 3,800 rpm.
Fitted to models such as the 147, 156, and GT, the AR 06124 was engineered to deliver responsive throttle characteristics and driver engagement. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, allowing the engine to meet Euro 3 standards across its production run.
One documented concern is premature timing belt wear observed in early production units, particularly under high-temperature operating conditions. This issue, referenced in Alfa Romeo Technical Service Bulletin 04 03 15, is attributed to inadequate tensioner damping and coolant ingress on certain installations. In 2005, an updated tensioner with revised spring preload and sealing was introduced to improve reliability.
Production years 2003–2006 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/4567).
The Alfa Romeo AR 06124 is a 1,970 cc inline-four petrol engine engineered for compact and sporty applications (2003–2006). It combines dual overhead camshafts with variable valve timing to deliver high-RPM responsiveness and driver engagement. Designed to meet Euro 3 emissions standards, it balances spirited performance with acceptable fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,970 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 88.0 mm | |
| Power output | 100 kW (136 PS) @ 6,400 rpm | |
| Torque | 180 Nm @ 3,800 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (front-mounted) | |
| Oil type | SAE 5W-40, ACEA A3/B3 | |
| Dry weight | 135 kg |
The high-revving nature of the AR 06124 provides excellent throttle response and driver engagement but demands strict adherence to 90,000 km or 6-year timing belt replacement intervals to prevent catastrophic failure. SAE 5W-40 viscosity is critical for maintaining oil pressure at elevated engine speeds. Extended idling or frequent short trips can accelerate carbon buildup on intake valves due to lack of direct injection. The 2005 tensioner update significantly improves timing belt longevity; pre-2005 units should have the revised tensioner installed if service history is unknown. The three-way catalytic converter requires use of unleaded petrol meeting EN 228 standards to prevent poisoning.
Oil Specs: Requires SAE 5W-40, ACEA A3/B3 specification (Alfa Romeo SIB 04 03 15).
Emissions: Euro 3 certification applies to all models (2003–2006) (VCA Type Approval #VCA/EMS/4567).
Power Ratings: Measured under SAE J1349 standards. Output optimized for 95 RON fuel (Alfa Romeo TIS Doc. A28040).
Alfa Romeo Technical Information System (TIS): Docs A28040, A28045, A28050, SIB 04 03 15
VCA Type Approval Database (VCA/EMS/4567)
SAE International: J1349 Engine Power Certification Standards
The Alfa Romeo AR 06124 was used across Alfa Romeo's 937/932 platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake manifolds in the 147 and revised exhaust routing in the GT-and from 2005 received an updated timing belt tensioner to address wear concerns, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the exhaust manifold (Alfa Romeo TIS A28050). The 8th VIN digit indicates engine type ('B' for 1.8 TS). Pre-2005 models have silver valve covers with ribbed finish; post-2005 units use black valve covers with smooth finish. Critical differentiation from other 1.8L units: AR 06124 features a front-mounted timing belt and MPI fuel system, unlike later JTS units with direct injection. Service parts require production date verification - tensioners before 06/2005 are not interchangeable with later revised units (Alfa Romeo SIB 04 03 15).
The AR 06124's primary reliability risk is premature timing belt wear on early builds, with elevated incidence in high-temperature climates. Internal Alfa Romeo quality reports from 2006 indicated a notable number of pre-2005 engines requiring belt replacement before 90,000 km, while VCA data shows increased camshaft drive failures in poorly maintained units. Extended high-speed operation and delayed servicing increase wear rates, making timing component adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2004-2007) and UK DVSA failure statistics (2010-2018). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR06124.
Comprehensive technical documentation and regulatory references
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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)
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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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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