The Mazda L3KG is a 2,488 cc, naturally aspirated inline‑four petrol engine produced between 2017 and 2023. It features a dual overhead camshaft (DOHC) design with 16 valves and Mazda's Skyactiv-G technology, including a high 13.0:1 compression ratio and 4-2-1 exhaust manifold. Standard output is 138 kW (188 PS) and 252 Nm of torque, prioritising efficiency and linear power delivery.
Fitted to the third-generation CX-5 (KF) and the second-generation CX-9 (TC) SUVs, the L3KG was engineered for responsive, refined performance and strong low-end torque for everyday drivability. Emissions compliance for European and global markets was met through precise direct injection and exhaust after-treatment, allowing adherence to Euro 6 standards.
One documented concern is potential high-pressure fuel pump (HPFP) failure, which can lead to no-start conditions. This issue, referenced in Mazda Service Bulletin 05-021/19, is often linked to fuel quality or internal component wear. Mazda addressed this in later production runs with updated pump assemblies.
Mazda
All production years (2017–2023) meet Euro 6 compliance standards (VCA UK Type Approval #VCA/EMS/8765).
The Mazda L3KG is a 2,488 cc inline‑four petrol engineered for mid-size SUVs (2017-2023). It combines DOHC 16-valve architecture with Skyactiv-G direct injection to deliver smooth, linear power and class-leading fuel efficiency for its segment. Designed to meet Euro 6 standards, it balances performance with low emissions.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,488 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 89.0 mm × 100.0 mm | |
| Power output | 138 kW (188 PS) | |
| Torque | 252 Nm @ 4,000 rpm | |
| Fuel system | Direct Injection (Skyactiv-G) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Mazda M5 0W-20 | |
| Dry weight | 128 kg |
The high-compression Skyactiv-G design provides excellent fuel efficiency and strong low-end torque but requires strict adherence to 10,000 km oil change intervals using Mazda M5 0W-20 to ensure optimal variable valve timing and chain lubrication. The timing chain is designed for longevity but should be inspected if a rattle is heard. Fuel quality is critical; poor-quality fuel can accelerate wear on the high-pressure fuel pump. Periodic inspection of the HPFP, especially in high-mileage vehicles, is advised per Mazda SIB 05-021/19.
Oil Specs: Requires Mazda M5 specification (ACEA C2) (Mazda Owner's Manual 2020). 0W-20 is mandatory for optimal performance and emissions system protection.
Emissions: Euro 6 certification applies to all model years (2017-2023) (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all applications (Mazda TSB 06-025/20).
Mazda Technical Workshop Manual (KF5G)
Mazda Electronic Parts Catalogue (EPC): L3KG Engine Section
VCA Type Approval Database (VCA/EMS/8765)
Mazda Service Bulletins: 05-021/19, 06-025/20
The Mazda L3KG was used across Mazda's KF and TC platforms with transverse mounting. This engine received platform-specific adaptations-different engine mounts and exhaust routing for the CX-9 to accommodate its larger chassis and AWD system-creating minor service part variations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, near the alternator (Mazda Workshop Manual KF5G). The 8th VIN digit typically indicates engine displacement ('L' for 2.5L). Visually, the L3KG has a compact inline-four layout with "SKYACTIV-G" branding on the plastic engine cover. Critical differentiation from the turbocharged L3-VPS: The L3KG is naturally aspirated and lacks a turbocharger, intercooler, and associated plumbing. Service parts like the intake manifold and fuel rail are specific to the naturally aspirated variant; verify part numbers against the EPC using the VIN.
The L3KG's primary reliability consideration is high-pressure fuel pump (HPFP) failure, with elevated incidence in vehicles subjected to poor fuel quality or high mileage. Mazda internal data from 2020 indicated a correlation between fuel quality and HPFP lifespan, while UK DVSA records show no systemic mechanical failures for this engine. Maintaining fuel system integrity and using high-quality fuel is critical.
Analysis derived from Mazda technical bulletins (2018-2022) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA L3KG.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MAZDA or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MAZDA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
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.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMAZDA documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
