The Mazda PEXT is a 2,488 cc, inline‑four naturally aspirated petrol engine introduced in 2019 for the CX‑5 and CX‑8. It features Mazda's Skyactiv‑G technology, including a high 13.0:1 compression ratio, cylinder deactivation (PEXT only), and direct injection, delivering 140 kW (190 PS) and 252 Nm of torque. Its dual variable valve timing (Dual S‑VVT) optimises efficiency and provides strong mid‑range pull for effortless highway cruising.
Fitted primarily to the fac…
Mazda
Production years 2019–Present meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/9876).
The Mazda PEXT is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for mid-size SUVs (2019-Present). It combines Skyactiv‑G direct injection with cylinder deactivation and Dual S‑VVT to deliver smooth, quiet performance and enhanced fuel economy. Designed to meet stringent Euro 6d-TEMP standards, it prioritises refinement and efficiency.
| 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 | 140 kW (190 PS) @ 6,000 rpm | |
Torque | 252 Nm @ 4,000 rpm | |
Fuel system | Direct injection with cylinder deactivation (cylinders 2 & 3) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven | |
Oil type | Mazda Moly 0W‑20 (API SP/ILSAC GF-6A) | |
Dry weight | 124 kg |
The Mazda PEXT was used across Mazda's KE platform with transverse mounting and no licensed status. This engine received no major platform-specific adaptations and is used consistently in its designated models, creating broad interchangeability within its production run. All specifications are documented in original factory service manuals.
The PEXT's primary documented characteristic is occasional MIL illumination related to its cylinder deactivation system, with elevated incidence noted in early software versions. Mazda's internal service data indicates most cases are resolved with ECU updates, while owner surveys report high overall satisfaction. Ensuring correct oil specification and software level is critical for seamless operation.
Analysis derived from Mazda technical bulletins (2019-Present) and owner club failure statistics (compiled 2020-2024). 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 PEXT is considered highly reliable with a robust Skyactiv-G foundation. Its main documented issue, occasional MIL illumination related to cylinder deactivation, is typically resolved with a simple ECU update. With regular oil changes using the specified 0W-20 oil, the engine is expected to provide excellent long-term service with minimal major issues.
The most frequently reported issue is the Check Engine Light illuminating due to cylinder deactivation system sensitivity, addressed by ECU updates. Other potential issues include S-VVT solenoid failures, IMRC actuator faults, and high-pressure fuel pump noise. These are generally well-understood and have straightforward OEM repair procedures.
The PEXT engine is used exclusively in the facelifted (2019+) Mazda CX-5 (KE chassis) and the Mazda CX-8 SUVs. It is not used in the Mazda3, CX-30, or any other Mazda models. It is distinguished from the standard 2.5L PE engine by its cylinder deactivation feature.
Minor power gains are possible via ECU remapping (typically +10-15 kW), leveraging its high 13:1 compression ratio. However, significant tuning is limited by its naturally aspirated design. Adding forced induction would require extensive internal modifications and is not recommended. Most tuning focuses on throttle response and torque curve optimization.
Excellent for a 2.5L naturally aspirated engine in an SUV. In a CX-5, expect combined figures of approximately 7.4 L/100km (38 mpg UK) under the WLTP test cycle. Real-world mixed driving typically yields 8.0-9.5 L/100km (30-35 mpg UK). The cylinder deactivation system significantly improves highway economy, often achieving 6.0-6.5 L/100km (43-47 mpg UK).
Yes. The Mazda PEXT is an interference engine. If the timing chain were to fail or jump timing (an extremely rare occurrence with this chain-driven design), the pistons would contact the valves, causing severe internal engine damage. Regular oil changes are crucial for chain longevity.
Mazda specifies their own 'Mazda Moly 0W-20' oil, meeting API SP/ILSAC GF-6A or ACEA C5 standards. This low-viscosity oil is essential for the proper operation of the cylinder deactivation system's hydraulic actuators and for overall engine protection. Change intervals should not exceed 10,000 km or 12 months.
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.