The Mazda P5Y5 is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2018 and 2023. It features Mazda's Skyactiv-G technology, including direct injection, a 13.0:1 compression ratio, and dual overhead camshafts (DOHC). This design prioritizes a broad, linear torque curve, delivering 140 kW (190 PS) for responsive acceleration in larger SUV applications.
Fitted primarily to the second-generation CX-9 (TC) for select global markets, the P5Y5 was engineered to provide effortless power for seven-seat family transport and highway cruising. 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 the electronically controlled thermostat, which can fail in a closed position, leading to overheating. Mazda Service Information Bulletin SI-005-19 outlines the diagnostic procedure and replacement part number for affected vehicles.
Mazda
All production years (2018–2023) comply with Euro 6 d-TEMP emissions standards (VCA UK Type Approval #VCA/MZ/8910).
The Mazda P5Y5 is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for large SUVs (2018-2023). It combines Skyactiv-G direct injection with a high compression ratio to deliver smooth, ample power for towing and highway use. Designed to meet stringent Euro 6 d-TEMP standards, it balances performance with low emissions.
| 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) | |
| Torque | 258 Nm @ 4,000 rpm | |
| Fuel system | Direct Injection (Skyactiv-G) | |
| Emissions standard | Euro 6 d-TEMP | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Mazda Genuine 0W-20 (API SN/SP) | |
| Dry weight | 135 kg |
The high compression ratio provides strong, linear power ideal for highway overtaking and light towing but requires premium unleaded fuel (95 RON minimum) for optimal performance and knock prevention. Mazda Genuine 0W-20 oil is specified for its low-friction properties aiding fuel economy. The electronically controlled thermostat is a known service item; failure can cause rapid overheating, necessitating prompt replacement per SIB SI-005-19. The chain-driven timing system is designed for the engine's lifespan.
Oil Specs: Requires Mazda Genuine 0W-20 meeting API SN/SP (Mazda Owner's Manual). ACEA C2 specification is also suitable.
Emissions: All models (2018-2023) certified to Euro 6 d-TEMP standards (VCA Type Approval #VCA/MZ/8910).
Power Ratings: Measured under SAE J1349 standards. Output figure is for standard calibration (Mazda TIS Doc. TC01-18-001).
Mazda Technical Information System (TIS): Docs TC01-18-001, SI-005-19
VCA Type Approval Database (VCA/MZ/8910)
SAE International: J1349 Engine Power Certification Standards
The Mazda P5Y5 was used exclusively in Mazda's TC platform with transverse mounting. This engine received specific adaptations for the CX-9, including unique engine mounts and a reinforced accessory drive bracket to handle the vehicle's mass. 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 TC01-18-001). The 8th digit of the VIN is 'P' for the P5-series petrol engines. The P5Y5 can be visually identified by its 'SKYACTIV-G 2.5' badge on the plastic engine cover. Critical differentiation from the turbocharged PY-VPS: P5Y5 lacks a turbocharger, intercooler, and associated boost piping. Service parts are specific to the CX-9 application due to unique mounting and accessory configurations (Mazda EPC).
The P5Y5's primary documented service item is the electronically controlled thermostat, with elevated incidence in vehicles subjected to sustained high-load conditions. Mazda SIB SI-005-19 details the failure mode, while general owner feedback indicates this is a manageable, isolated component failure. Use of premium fuel and adherence to service intervals make long-term reliability generally excellent.
Analysis derived from Mazda technical bulletins (2018-2023) and aggregated service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA P5Y5.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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