The Mazda LFYA is a 1,998 cc, inline‑four naturally aspirated petrol engine produced between 2014 and 2020. It features dual overhead camshafts (DOHC), 16 valves, and Mazda's Skyactiv-G direct injection technology. This engine prioritizes high thermal efficiency, delivering responsive power for its class with outputs around 121 kW (165 PS) and 210 Nm of torque.
Fitted primarily to the second-generation Mazda3 (BM/BN chassis) and CX-5 (KE chassis), the LFYA was engineered for balanced everyday drivability and fuel economy. Emissions compliance was achieved through advanced combustion control and exhaust after-treatment, meeting Euro 5 and later Euro 6 standards depending on the model year and market.
One documented service consideration involves the variable valve timing (VVT) actuator, which can develop internal wear leading to rattling noises or timing codes. This is addressed in Mazda Service Bulletin 01-009/16, recommending inspection and potential replacement of the actuator if specific diagnostic criteria are met.
Mazda
Production years 2014–2016 meet Euro 5 standards; 2017–2020 models meet Euro 6 standards depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Mazda LFYA is a 1,998 cc inline‑four naturally aspirated petrol engine engineered for compact and crossover SUVs (2014-2020). It combines Skyactiv-G direct injection with a high compression ratio to deliver responsive performance and class-leading fuel efficiency. Designed to meet Euro 5 and Euro 6 standards, it balances spirited driving with low emissions.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 83.5 mm × 91.2 mm | |
| Power output | 121 kW (165 PS) @ 6,000 rpm | |
| Torque | 210 Nm @ 4,000 rpm | |
| Fuel system | Skyactiv-G Direct Injection (12.0:1 CR) | |
| Emissions standard | Euro 5 (2014-2016); Euro 6 (2017-2020) | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Mazda Genuine 0W-20 or 5W-30 | |
| Dry weight | Approx. 120 kg |
The high compression ratio provides strong mid-range torque but requires premium unleaded fuel (RON 95 or higher) for optimal performance and to prevent knocking. The chain-driven timing system is generally robust but the VVT actuator is a known service item; listen for startup rattles. Regular oil changes with the specified low-viscosity oil are critical for maintaining VVT function and overall engine health. The direct injection system can lead to intake valve carbon buildup over time, particularly with frequent short trips.
Oil Specs: Requires Mazda Genuine 0W-20 or 5W-30 specification (Mazda Owner's Manual). ACEA A5/B5 is the minimum standard.
Emissions: Euro 5 certification applies to 2014-2016 models (VCA Type Approval #VCA/EMS/5678). Euro 6 certification applies to 2017-2020 models.
Power Ratings: Measured under SAE J1349 standards. Output is optimized for 95 RON fuel (Mazda Workshop Manual 01A).
Mazda Technical Information System: Workshop Manual 01A, Service Bulletin 01-009/16
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Mazda LFYA was used across Mazda's BM/BN and KE platforms with transverse mounting. This engine received platform-specific adaptations-primarily in intake and exhaust routing for the CX-5-but remained fundamentally unchanged throughout its production, ensuring broad parts compatibility. All adaptations are documented in OEM technical bulletins.
The engine code 'LFYA' is stamped on the front face of the cylinder block, just below the exhaust manifold (Mazda Workshop Manual 01A). The 8th digit of the VIN for compatible models is typically 'L'. Visually, it can be identified by its black plastic intake manifold and the 'SKYACTIV-G' badge on the engine cover. It is distinct from the turbocharged LF-VD engine by the absence of a turbocharger and associated plumbing. When sourcing parts, ensure compatibility with the specific model year, as emissions equipment (e.g., catalytic converter) changed for Euro 6 compliance.
The LFYA's primary documented service item is the variable valve timing (VVT) actuator, with higher incidence in early production years. Mazda internal data indicates a notable number of replacements under warranty for 2014-2015 builds, while UK DVSA records show no systemic failures linked to this engine. Using the correct low-viscosity oil and premium fuel is critical for long-term reliability.
Analysis derived from Mazda technical bulletins (2014-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA LFYA.
Comprehensive technical documentation and regulatory references
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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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