The Lexus A35A — FXS is a 2,487 cc, inline‑four Atkinson‑cycle petrol engine paired with an electric motor in Toyota’s fourth‑generation hybrid system. Produced from 2018 onward, it features direct and port fuel injection (D‑4S), variable valve timing‑intelligent electric (VVT‑iE), and an exhaust gas recirculation (EGR) system. Peak combined system output ranges from 160–227 kW (218–308 PS), depending on application, with strong low‑rpm torque and seamless elect…
All production years (2018–present) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/8765).
The Lexus A35A-FXS is a 2,487 cc inline‑four Atkinson‑cycle petrol hybrid engineered for mid‑size and executive sedans and SUVs (2018–present). It combines D‑4S dual injection with VVT‑iE on the intake cam to deliver smooth, quiet operation and high thermal efficiency. Designed to meet Euro 6d standards from launch, it balances urban electric driving with highway petrol performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,487 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Inline‑4, DOHC, 16‑valve, Atkinson cycle | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.5 mm × 103.4 mm | |
Power output | 131–165 kW (178–224 PS) petrol; 160–227 kW (218–308 PS) combined | |
Torque | 221 Nm @ 3,600–5,200 rpm (petrol); 221–320 Nm (combined) | |
Fuel system | D‑4S (direct + port injection) | |
Emissions standard | Euro 6d | |
Compression ratio | 14.0:1 | |
Cooling system | Water‑cooled (dual circuit: engine + inverter) | |
Turbocharger | None | |
Timing system | Chain (maintenance‑free design) | |
Oil type | Toyota Genuine Motor Oil 0W‑20 (ILSAC GF‑6 / API SP) | |
Dry weight | 138 kg (engine only) |
The Lexus A35A-FXS was used across Lexus's GA-K and TNGA-K platforms with transverse mounting and shared with Toyota for global hybrid applications. This engine received platform-specific adaptations—revised motor/generator sizing in the ES 300h versus torque-biased tuning in the NX 350h—and from 2023 the Crown adopted a performance-oriented calibration with enhanced regenerative braking. All adaptations are documented in OEM technical bulletins.
The A35A-FXS's primary reliability risk is inverter coolant pump failure in early builds, with elevated incidence in high-temperature climates. Toyota internal field data from 2022 indicated a measurable rate of hybrid system shutdowns in pre-2022 vehicles, while UK DVSA records show minimal emissions-related failures due to robust catalyst design. Extended idling and frequent short trips increase thermal stress on the pump, making periodic inspection critical.
Analysis derived from Toyota technical bulletins (2018-2024) and UK DVSA failure statistics (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
Yes, the A35A-FXS is highly reliable when maintained properly. Early models (2018–2021) had a known inverter coolant pump issue, addressed by Toyota in 2022. The engine itself has no timing belt, uses durable chain drive, and benefits from Toyota’s proven hybrid architecture. Regular oil changes with correct 0W-20 oil ensure longevity beyond 300,000 km.
The main issues are inverter coolant pump seal failure (pre-2022), hybrid battery cooling fan wear, VVT-iE solenoid sludge from incorrect oil, and exhaust heat shield rattles. All are documented in Toyota service campaigns or TIS bulletins. No major engine or transaxle failures are widespread in OEM data.
The A35A-FXS powers the Lexus ES 300h (2018–present), NX 350h (2021–present), and previously the Toyota Camry Hybrid (2018–2024) and Crown Hybrid (2022–present). It is part of Toyota’s TNGA-K global hybrid platform and is not used in rear-wheel-drive Lexus models like the IS or GS.
Limited tuning potential exists. The hybrid ECU is tightly integrated, and Toyota does not support aftermarket remapping. Minor gains are possible via regenerative braking calibration or inverter cooling upgrades, but significant power increases risk hybrid system instability. Most owners prioritize reliability over tuning.
Excellent. In the Lexus ES 300h, real-world consumption is ~5.2 L/100km (city) and ~4.3 L/100km (highway), or ~55 mpg UK combined. The NX 350h achieves ~5.8 L/100km (~49 mpg UK) due to higher weight. EV-only range is limited to ~2–3 km at low speeds, but overall efficiency remains class-leading.
Yes. Like all modern DOHC engines, the A35A-FXS is an interference design. However, it uses a maintenance-free timing chain with no known widespread failures. Chain stretch or jump is extremely rare under normal conditions, but catastrophic failure would cause valve-piston contact.
Toyota specifies 0W-20 synthetic oil meeting ILSAC GF-6 and API SP standards. Genuine Toyota oil or equivalent is required. Using thicker or non-approved oil can impair VVT-iE operation and increase sludge risk. Change every 15,000 km or 12 months, whichever comes first.
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