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 Leg…
Subaru
All production years (2019–2025) meet Euro 6d emissions standards .
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 162 kg |
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.
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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.
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The FA24 offers strong performance and good refinement, but early models (2019–2021) had reliability concerns, particularly timing chain rattle. Later revisions (post-2022) improved component durability, so well-maintained examples can exceed 150,000 km. Regular servicing with OEM-specified oil (0W-20) and timely chain maintenance greatly enhance longevity.
The most frequent issues are timing chain rattle, intake valve carbon buildup, and water pump coolant leaks. These are well-documented in Subaru service bulletins. Chain issues are linked to oil pressure and lubrication, while carbon buildup stems from direct injection design. Coolant leaks are design-related and affect pre-2022 units most.
This 2.4L turbo petrol engine was used in Subaru's mid-size and utility cars under the SUBARU engineering designation. It powers the Ascent, Outback XT, and Legacy XT variants. It is part of the FA engine family and is designed for transverse applications. All applications meet Euro 6d emissions standards.
Aftermarket ECU tuning is common on the FA24 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.
Moderate for a turbocharged utility engine. In an Ascent from 2020, combined consumption is ~9.8 L/100km (28.8 mpg UK). City driving may see 11.0–12.5 L/100km, while highway runs can achieve ~7.5 L/100km. Real-world figures depend heavily on driving style, as the engine rewards smooth inputs. Expect 27–31 mpg (UK) on mixed routes for a well-maintained FA24.
Yes. The FA24 uses an interference timing chain design. This means if the chain skips or breaks, the pistons will contact the valves, causing catastrophic internal damage. Any timing fault requires immediate attention to avoid severe engine damage. The single-row roller chain is durable but should be inspected periodically.
Specifies SAE 0W-20 API SN oil meeting Subaru specification. This formulation protects the hydraulic lifters and camshaft. Change intervals should not exceed 10,000 km or 6 months. Using incorrect oil can accelerate lifter wear and reduce engine lifespan. Always use high-quality petrol to support engine longevity.
Comprehensive technical documentation and regulatory references
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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.
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