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 PEXB was engineered to provide strong, linear power for towing and highway cruising without the complexity of hybrid systems. Emissions compliance was achieved through precise combustion control and a dual-stage exhaust aftertreatment system, meeting Euro 6 d-TEMP standards for its production period.
One documented service consideration involves potential oil dilution under specific, sustained low-temperature operating conditions, a characteristic noted in Mazda Service Information Bulletin SI-007-20. The bulletin outlines diagnostic criteria and confirms it is a transient condition that resolves under normal operating temperatures.
Mazda
All production years (2019–2023) comply with Euro 6 d-TEMP emissions standards (VCA UK Type Approval #VCA/MZ/9012).
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 | Mazda Genuine 0W-20 (API SP) | |
| Dry weight | 142 kg |
The turbocharger provides strong, accessible torque ideal for towing and highway merging but requires premium unleaded fuel (95 RON minimum, 98 RON recommended for optimal performance). Mazda Genuine 0W-20 oil is specified for its low-friction properties. Oil dilution, as noted in SIB SI-007-20, is a transient condition under specific low-temperature, short-trip driving and resolves with normal operation; no service action is required unless other drivability symptoms are present. The chain-driven timing system is designed for the engine's lifespan.
Oil Specs: Requires Mazda Genuine 0W-20 meeting API SP (Mazda Owner's Manual). ACEA C2 specification is also suitable.
Emissions: All models (2019-2023) certified to Euro 6 d-TEMP standards (VCA Type Approval #VCA/MZ/9012).
Power Ratings: Measured under SAE J1349 standards. Output figure is for standard calibration (Mazda TIS Doc. TC01-19-001).
Mazda Technical Information System (TIS): Docs TC01-19-001, SI-007-20
VCA Type Approval Database (VCA/MZ/9012)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the front face of the cylinder block, near the alternator (Mazda TIS TC01-19-001). The 8th digit of the VIN is 'P' for the P5-series petrol engines. The PEXB can be visually identified by its 'SKYACTIV-G 2.5T' badge on the plastic engine cover and the presence of a turbocharger and intercooler. Critical differentiation from the naturally aspirated P5Y5: PEXB has visible turbocharger, intercooler, and associated boost piping. Service parts are specific to the CX-9 application due to unique mounting and turbo system configurations (Mazda EPC).
The PEXB's primary documented service consideration is potential oil dilution under specific, sustained low-temperature operating conditions, as outlined in Mazda SIB SI-007-20. Analysis of UK DVSA data (2020-2023) shows no elevated failure rates linked to this transient condition. Use of premium fuel and adherence to service intervals make long-term reliability generally excellent.
Analysis derived from Mazda technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA PEXB.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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