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 P5Y…
Mazda
All production years (2018–2023) comply with Euro 6 d-TEMP emissions standards .
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 135 kg |
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.
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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.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the P5Y5 is generally considered a very reliable engine. Its naturally aspirated design and chain-driven timing system contribute to its longevity. The main known service item is the electronically controlled thermostat, which is a straightforward and relatively inexpensive repair. With regular maintenance and use of the correct fuel and oil, these engines are expected to last well beyond 200,000 km.
The most frequently documented issue is failure of the electronically controlled thermostat, which can cause overheating. Other potential issues include malfunctioning VVT solenoids, failing IMRC actuators, and minor oil leaks from the valve cover gasket. These are all covered in Mazda service information and are generally not catastrophic failures.
The P5Y5 2.5L naturally aspirated petrol engine was used exclusively in the second-generation Mazda CX-9 (TC chassis, 2018-2023) for markets where the turbocharged variant was not offered or as a lower-tier option. It was not used in any other Mazda model.
Significant power gains are difficult due to its naturally aspirated, high-compression design. ECU remaps can yield minor improvements (5-10 kW) by optimizing ignition and fuel maps, but the primary benefit is often smoother power delivery. Forced induction is not a practical or supported modification for this engine.
Fuel economy is respectable for a large SUV. In a CX-9 2.5L, expect around 9.5-11.0 L/100km (26-30 mpg UK) in combined driving. Real-world economy heavily depends on driving style, passenger/cargo load, and terrain. It is less efficient than the turbocharged variant under heavy load.
Yes. The P5Y5 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 P5Y5. This low-viscosity oil is crucial for optimal fuel economy and the proper operation of the VVT system. Using the correct specification is essential for long-term engine health.
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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