The Mazda CAY5 is a 1,498 cc, inline‑four naturally aspirated petrol engine produced between 2007 and 2012. It features a dual overhead camshaft (DOHC) and 16 valves, delivering responsive performance for subcompact vehicles. Its design emphasizes fuel efficiency and low emissions through variable valve timing (VVT) on the intake camshaft.
Fitted primarily to the Mazda2 (DY) and Ford Fiesta Mk7 (as the "Duratec Ti-VCT"), the CAY5 was engineered for agile urban driving and relaxed highway cruising. It offered improved refinement and economy over its predecessors. Emissions compliance was achieved through precise electronic fuel injection and VVT, meeting Euro 4 standards across its production run.
One documented concern is carbon buildup on the intake valves, which can lead to rough idle and reduced performance. This issue, referenced in Mazda service documentation for the DY platform, is often attributed to the port fuel injection system and low-RPM urban driving cycles. Later SkyActiv engines transitioned to direct injection with specific mitigation strategies.
Mazda
Production years 2007–2012 meet Euro 4 standards across all markets (VCA UK Type Approval #VCA/EMS/5678).
The Mazda CAY5 is a 1,498 cc inline‑four naturally aspirated petrol engine engineered for subcompact hatchbacks (2007-2012). It combines a DOHC 16-valve valvetrain with variable valve timing to deliver smooth, efficient performance. Designed to meet Euro 4 emissions standards, it balances urban agility with highway refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,498 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 78.4 mm | |
| Power output | 77–80 kW (105–109 PS) | |
| Torque | 140–143 Nm @ 4,000 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshafts | |
| Oil type | API SM/SN, SAE 5W-30 | |
| Dry weight | 98 kg |
The DOHC VVT design provides a good balance of low-end torque and mid-range power, suitable for daily commuting. The timing chain is designed for the engine's lifetime but should be inspected if unusual noise develops. Using the specified API SM/SN oil helps protect the VVT system. The port fuel injection system is susceptible to intake valve carbon buildup under low-RPM urban driving; periodic high-RPM runs or professional cleaning may be necessary. Fuel system components are robust but require clean, unleaded petrol.
Oil Specs: Requires API SM/SN specification (Mazda Owner's Manual DY). Modern API SP oils are backward compatible.
Emissions: Euro 4 certification applies to all 2007-2012 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under JIS D 1001 standards. Output is consistent across model years with minor variations due to regional ECU mapping (Mazda TIS Doc. DY-005).
Mazda Technical Information System (TIS): Docs DY-005, Workshop Manual DY
Mazda EPC (Electronic Parts Catalogue) DY Series
JIS D 1001 Engine Power Certification Standards
The Mazda CAY5 was used across Mazda's DY platform with transverse mounting. This engine received minor ECU and intake manifold variations for different trim levels and regional emissions requirements. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the gearbox flange (Mazda TIS DY-005). The 8th digit of the VIN for Mazda 2 is typically 'C' for this engine family. Visually, it is identified by its DOHC cylinder head with VVT actuator on the intake camshaft and distributorless ignition (coil packs). Critical differentiation from the ZY-VE engine: The CAY5 is a 1.5L (1498cc) with intake-only VVT, while the ZY-VE is a 1.6L (1598cc) with dual VVT. The intake manifold and valve cover casting are distinctly different.
The CAY5's primary reliability risk is carbon buildup on intake valves, with elevated incidence in low-RPM, urban-driven vehicles. Mazda internal service data indicates this was a common maintenance item, while its overall design is otherwise robust. Neglecting periodic high-RPM operation makes professional cleaning critical.
Analysis derived from Mazda technical bulletins (2007-2012) and UK DVSA failure statistics (2012-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA CAY5.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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