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 drivin…
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 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.
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.
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Yes, the CAY5 is generally very reliable long-term. The main exceptions are intake valve carbon buildup and VVT solenoid failure, which are common wear items. With regular maintenance and periodic high-RPM driving to clean valves, these engines can easily surpass 250,000 km. Using correct oil and addressing issues promptly is key.
The most common problems are carbon buildup on intake valves, VVT solenoid failure, ignition coil pack failure, and coolant temperature sensor failure. These are well-documented in Mazda service literature for the Mazda2 (DY) and Ford Fiesta Mk7 platforms.
The CAY5 was primarily used in the Mazda2 (DY generation, 2007-2012). It was also licensed to Ford and used in the European Ford Fiesta Mk7 (2008-2012) where it was known as the 1.5L 'Duratec Ti-VCT' engine. It was not used in later Mazda2 (DJ) or Demio models.
Minor tuning is possible. Upgrades include a performance air filter, a free-flowing exhaust, and ECU remapping. Significant power gains are limited by the engine's naturally aspirated design. Focus is usually on improving throttle response and mid-range torque.
Fuel economy is excellent for its era. Expect around 5.5–6.0 L/100km (47–51 mpg UK) on the highway and 7.0–7.5 L/100km (38–40 mpg UK) in the city for a well-maintained example. Real-world figures vary based on driving style, vehicle condition, and transmission type.
Yes. The Mazda CAY5 is an interference engine. If the timing chain were to fail, the pistons and valves will collide, causing catastrophic internal damage. Fortunately, the chain is very robust and designed to last the engine's lifetime.
Mazda specifies API SM or SN grade oil, typically in 5W-30 viscosity. Modern, high-quality API SP oils in the same viscosity are perfectly suitable and offer better protection. Regular oil changes every 15,000 km or annually are recommended.
Comprehensive technical documentation and regulatory references
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MAZDA Official Site
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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
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