The Mazda HE3 is a 1,998 cc, inline‑four naturally aspirated petrol engine produced between 2012 and 2018. It features dual overhead camshafts (DOHC), 16 valves, and Mazda's Skyactiv — G direct injection technology. This engine was designed for efficiency, delivering outputs around 118 kW (160 PS) and 210 Nm of torque, making it suitable for responsive everyday driving.
Fitted primarily to the DJ — generation Mazda 3 and second — generation CX — 5, the HE3 was engineered fo…
Mazda
Production years 2012–2018 meet Euro 5 standards .
The Mazda HE3 is a 1,998 cc inline‑four naturally aspirated petrol engine engineered for compact and crossover SUVs (2012-2018). It combines Skyactiv-G direct injection with a high compression ratio to deliver smooth, high-revving performance and efficient fuel consumption. Designed to meet Euro 5 standards, it balances spirited driving with everyday economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 83.5 mm × 91.2 mm | |
Power output | 118 kW (160 PS) @ 6,000 rpm | |
Torque | 210 Nm @ 4,000 rpm | |
Fuel system | Direct Injection (Skyactiv-G) | |
Emissions standard | Euro 5 | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with VVT | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 122 kg |
The Mazda HE3 was used across Mazda's DJ and KE platforms with transverse mounting. This engine received platform-specific adaptations-lightweight subframes in the CX-5 and revised engine mounts in the facelifted Mazda 3 (2015)-creating minor service part variations. 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.
The HE3's primary reliability risk is variable valve timing (VVT) actuator failure, with elevated incidence in vehicles subjected to extended oil change intervals. Mazda internal reports noted a correlation between actuator faults and non-compliant oil usage, while owner feedback frequently cites a rattle on cold start. Maintaining strict oil quality and change schedules is critical to prevent costly repairs.
Analysis derived from Mazda technical bulletins (2013-2018) and aggregated owner-reported failure data (2015-2023). 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 HE3 is generally a robust and reliable engine when maintained properly. Its main weakness is the VVT actuator, which can fail if oil changes are neglected or incorrect oil is used. With regular servicing using the correct 0W-20 or 5W-30 oil, the HE3 can easily surpass 200,000 km without major issues.
The most frequent issues are VVT actuator failure (causing noise and codes), carbon buildup on intake valves (affecting idle and response), and wear on the high-pressure fuel pump. PCV system degradation leading to oil leaks is also common on higher-mileage examples.
The HE3 engine was primarily used in the second-generation Mazda 3 (DJ chassis, 2012-2018) and the first-generation Mazda CX-5 (KE chassis, 2012-2017). It was the standard 2.0L petrol engine for these models in most global markets.
Yes, the HE3 responds well to tuning. A simple ECU remap can yield gains of 10-15 kW and 20-30 Nm. More aggressive modifications like a performance exhaust and intake can extract further power. The engine's high compression ratio limits forced induction without internal upgrades.
Fuel economy is very good for a naturally aspirated petrol engine. Expect combined figures of around 6.0 L/100km (47 mpg UK) for the Mazda 3 and 6.5 L/100km (43 mpg UK) for the CX-5. Real-world consumption will vary based on driving style and conditions.
Yes. The Mazda HE3 is an interference engine. If the timing chain were to fail (an extremely rare event on this engine), the pistons would collide with the open valves, causing catastrophic internal damage. Fortunately, the chain is very durable.
Mazda strongly recommends using their Genuine 0W-20 oil for optimal fuel economy and engine protection. A 5W-30 meeting API SN/RC specifications is also acceptable, especially in hotter climates. Using the correct low-ash oil is vital for the VVT system and to minimize carbon buildup.
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.