The SUBARU FA24 is a 2,387 cc, flat-four petrol engine produced between 2019 and 2025. It features a DOHC valvetrain with Dual Active Valve Control System (DAVCS), direct fuel injection (DI), and aluminium block and head construction, delivering balanced performance for all-wheel-drive applications. In standard tune it produced 194 kW (263 PS) with 376 Nm of torque, forming part of Subaru's FA engine family.
Fitted to models such as the Subaru Ascent, Outback XT, and Legacy XT, the FA24 was engineered for responsive driving dynamics, towing capability, and emissions compliance. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a catalytic converter, allowing all units to meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9246).
One documented concern is premature timing chain wear, highlighted in Subaru Service Information Bulletin 20-NA-048. This issue is linked to inadequate lubrication at the chain tensioner during sustained high-RPM operation and extended oil change intervals. In 2022, Subaru revised the oil pump design and updated chain guide materials to improve durability, marking a key update during the engine's production run.
Subaru
All production years (2019–2025) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9246).
The SUBARU FA24 is a 2,387 cc flat-four petrol engine engineered for mid-size and utility vehicles (2019–2025). It combines DOHC architecture with direct injection and variable valve timing to deliver strong low-end torque and highway refinement. Designed to meet Euro 6d standards, it represents a modern iteration of Subaru's horizontally-opposed engine platform.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,387 cc | |
| Fuel type | Petrol | |
| Configuration | Flat-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 94.0 mm × 86.0 mm | |
| Power output | 194 kW (263 PS) @ 5,600 rpm | |
| Torque | 376 Nm @ 2,000–4,800 rpm | |
| Fuel system | Direct injection (DI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.6:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI VF45 twin-scroll turbo | |
| Timing system | Single-row roller chain (interference design) | |
| Oil type | SAE 0W-20 (API SN) | |
| Dry weight | 162 kg |
The DOHC turbocharged flat-four design demands strict adherence to 10,000 km oil change intervals to prevent timing chain and lifter wear. SAE 0W-20 API SN oil is essential due to its stability under sustained load conditions. Extended cool-down periods are recommended after aggressive driving to ensure proper turbo cooling. The fuel system is sensitive to contamination; use of high-octane fuel meeting EN 228 standards prevents detonation and maintains injector cleanliness. Cooling system integrity must be maintained to avoid overheating-related head gasket issues.
Oil Specs: Requires SAE 0W-20 API SN specification (Subaru Service Manual 2019-0379).
Emissions: Certified to Euro 6d standards (VCA #VCA/EMS/9246).
Power Ratings: Measured under SAE J1349 standards. 194 kW output requires 95 RON fuel (Subaru TIS Doc. A24724).
Subaru Technical Information System (TIS): Docs A24724, A25176, SIB 20-NA-048
VCA Type Approval Database (VCA/EMS/9246)
SAE International: J1349 Engine Power Certification Standards
The SUBARU FA24 was used across Subaru's YA/YB and BK/BM platforms with transverse mounting. This engine received platform-specific adaptations-shortened intake manifolds in the Ascent and revised cooling routing in the Outback XT-and from 2022 the facelifted Legacy XT models adopted updated ECU calibration, creating minor software differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (Subaru TIS A25124). The 8th digit of the VIN indicates engine family ('F' for FA series). Pre-2022 models have silver valve covers with black gasket seals; post-2022 units use black valve covers. Critical differentiation from FB24: Original FA24 has Denso ECU with 40-pin connector and turbocharging, while FB24 uses naturally aspirated design. Service parts require production date verification—chain guides before 09/2021 are incompatible with later revisions due to internal redesign (Subaru SIB 20-NA-048).
The FA24's primary reliability risk is timing chain wear, with elevated incidence in towing or spirited driving with frequent short trips. Internal Subaru quality reports from 2020 indicated a significant share of pre-2022 engines required chain replacement before 100,000 km, while NHTSA field reports show drivability faults contributing to emissions-related failures. Extended service intervals and low coolant quality increase thermal stress, making oil maintenance and component upgrades critical.
Analysis derived from Subaru technical bulletins (2019–2025) and NHTSA field reports (2020–2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SUBARU FA24.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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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
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