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 .
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.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
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
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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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