The Lexus A25A — FKS is a 2,487 cc, inline‑four turbocharged petrol engine introduced in 2018. It features Toyota's Dynamic Force architecture with D — 4S direct and port fuel injection, VVT — iE (electric) on the intake, and VVT — i (hydraulic) on the exhaust. This combination targets exceptional thermal efficiency (up to 40%) while delivering 152 kW (204 PS) and 250 Nm of torque, providing strong, linear acceleration.
Fitted to models such as the ES 250, NX 250, and RX 250, th…
Production years 2018–Present meet Euro 6d-TEMP/Euro 6d standards depending on model year and market (VCA UK Type Approval #VCA/EMS/5678).
The Lexus A25A-FKS is a 2,487 cc inline‑four turbocharged petrol engineered for mid‑size luxury sedans and SUVs (2018-Present). It combines Dynamic Force architecture with D-4S dual injection to deliver smooth, responsive power and class-leading thermal efficiency. Designed to meet Euro 6d and ULEV II standards, it balances performance with low emissions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,487 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 90.0 mm × 97.6 mm | |
Power output | 152 kW (204 PS) @ 6,600 rpm | |
Torque | 250 Nm @ 4,000 - 5,000 rpm | |
Fuel system | D-4S Direct & Port Injection | |
Emissions standard | Euro 6d-TEMP / Euro 6d, ULEV II | |
Compression ratio | 13.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single-scroll turbocharger | |
Timing system | Chain-driven | |
Oil type | Toyota Genuine Motor Oil 0W-16 or 0W-20 | |
Dry weight | Approx. 165 kg |
The Lexus A25A-FKS was developed by Toyota for its global luxury brand, used across Lexus's GA-K platform with transverse mounting. This engine features platform-specific calibrations for noise, vibration, and harshness (NVH) refinement in Lexus applications. All adaptations are documented in OEM technical bulletins.
The A25A-FKS' primary long-term consideration is intake valve carbon buildup, a common trait in GDI engines with low port injection contribution. Toyota TSB EG-0048-21 acknowledges this for preventative maintenance, while owner data suggests it's manageable with proper fuel and driving habits. Extended low-RPM, low-load driving cycles can accelerate deposit formation, making occasional higher-RPM operation and quality fuel critical.
Analysis derived from Toyota technical bulletins (2018-2024) and aggregated owner-reported data (2020-2024). 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
The A25A-FKS is considered a very reliable and advanced engine. Its primary long-term consideration is potential intake valve carbon buildup, which is manageable with preventative maintenance. Using the correct 0W-16 oil and adhering to service intervals are crucial for longevity, particularly for the electric VVT-iE system.
The most noted issues are intake valve carbon buildup (addressed in TSB EG-0048-21), sensitivity of the electric VVT-iE actuator to poor oil quality, a brief cold-start turbo wastegate rattle (considered normal), and minor oil consumption within Toyota's specified limits.
The A25A-FKS turbocharged petrol engine is found in the current generation Lexus ES 250 (2018–Present), NX 250 (2022–Present), and RX 250 (2023–Present). It is the turbocharged counterpart to the hybrid A25A-FXS engine.
Yes, ECU remapping is possible and can yield modest gains of 15-25 kW. However, Toyota's calibration is already highly optimized for efficiency and reliability. Significant power increases would require supporting modifications and may compromise longevity or void warranties.
Excellent for its performance. In the Lexus ES 250, expect around 7.5-8.5 L/100km (31-38 mpg UK) combined in real-world driving. The NX 250 and RX 250, being SUVs, will be slightly higher, typically 8.0-9.5 L/100km (30-35 mpg UK) combined.
Yes. Like virtually all modern engines, the A25A-FKS is an interference design. A timing chain failure could result in severe internal engine damage. Fortunately, the chain-driven system is very robust and designed to last the life of the engine with proper oil maintenance.
Toyota mandates the use of 0W-16 viscosity oil meeting their 'Genuine Motor Oil' specification for optimal fuel economy and VVT-iE performance. 0W-20 is an approved alternative if 0W-16 is unavailable, though it may slightly reduce efficiency.
Comprehensive technical documentation and regulatory references
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