The Mazda PEXB is a 2,488 cc, inline‑four turbocharged petrol engine produced between 2019 and 2023. It features Mazda's Skyactiv — G technology, including direct injection, a 10.5:1 compression ratio, and dual overhead camshafts (DOHC). This design prioritizes a broad, flat torque curve, delivering 170 kW (231 PS) and 350 Nm for effortless acceleration in premium SUV applications.
Fitted primarily to the second — generation CX — 9 (TC) for select global markets, the PE…
Mazda
All production years (2019–2023) comply with Euro 6 d-TEMP emissions standards .
The Mazda PEXB is a 2,488 cc inline‑four turbocharged petrol engine engineered for large SUVs (2019-2023). It combines Skyactiv-G direct injection with a turbocharger to deliver strong, accessible torque for towing and spirited driving. Designed to meet stringent Euro 6 d-TEMP standards, it balances high performance with controlled emissions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,488 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 89.0 mm × 100.0 mm | |
Power output | 170 kW (231 PS) | |
Torque | 350 Nm @ 2,000 rpm | |
Fuel system | Direct Injection (Skyactiv-G) | |
Emissions standard | Euro 6 d-TEMP | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single turbocharger (IHI supplied) | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Mazda PEXB was used exclusively in Mazda's TC platform with transverse mounting. This engine received specific adaptations for the CX-9, including unique engine mounts, a reinforced accessory drive, and a specific intercooler assembly. All adaptations are documented in OEM technical bulletins.
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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 manufacturer technical service bulletins and industry workshop records. 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
Yes, the PEXB is generally considered a very reliable engine. Its robust design and chain-driven timing system contribute to its longevity. The documented oil dilution is a transient, non-damaging condition. The main considerations are potential turbocharger wastegate rattle and managing intake valve carbon buildup. With regular maintenance and use of the correct premium fuel and oil, these engines are expected to last well beyond 200,000 km.
The most frequently discussed issues are the potential for transient oil dilution (a documented characteristic, not a failure), turbocharger wastegate rattle, and the common Skyactiv-G issue of intake valve carbon buildup. High-pressure fuel pump failure is also a known, though less frequent, issue. These are covered in Mazda service information.
The PEXB 2.5L turbocharged petrol engine was used exclusively in the second-generation Mazda CX-9 (TC chassis, 2019-2023) as the top-tier petrol engine option. It was not used in any other Mazda model during its production run.
Aftermarket ECU tuning is common on the PEXB 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.
Fuel economy is reasonable for a large, turbocharged SUV. In a CX-9 2.5T, expect around 10.5-12.5 L/100km (23-27 mpg UK) in combined driving. Real-world economy heavily depends on driving style; aggressive use of the turbo will significantly increase consumption, while gentle driving can yield better figures.
Yes. The PEXB is an interference engine. This means that if the timing chain were to fail (an extremely rare event for this design), the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the timing chain is designed to last the engine's lifetime.
Mazda specifies Mazda Genuine 0W-20 engine oil for the PEXB. This low-viscosity oil is crucial for optimal fuel economy and the proper operation of the engine under all conditions, including the potential for transient oil dilution. Using the correct specification is essential for long-term engine health.
Comprehensive technical documentation and regulatory references
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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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