The Ford F4B is a 2,261 cc, inline — four turbocharged petrol engine introduced in 2023 as part of the Ford EcoBoost engine family. It features direct and port fuel injection (dual injection), twin — scroll turbocharging, and variable cam timing (VCT) on both intake and exhaust camshafts. Delivering 210 kW (286 PS) and 440 Nm of torque, it offers strong mid — range performance and responsiveness in performance — oriented applications.
Fitted to the Ford Focus ST and select Eu…
Production years 2023–present meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/5679).
The Ford F4B is a 2,261 cc inline-four turbocharged petrol engine designed for high-performance hatchbacks (2023–present). It combines dual fuel injection with a twin-scroll turbocharger and dual VCT to deliver responsive power and broad torque. Engineered to meet Euro 6d standards, it balances performance with emissions compliance and fuel flexibility.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,261 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (twin-scroll) | |
Bore × stroke | 87.5 mm × 94.6 mm | |
Power output | 210 kW (286 PS) @ 5,800 rpm | |
Torque | 440 Nm @ 3,000–4,000 rpm | |
Fuel system | Dual injection (direct + port, up to 350 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single BorgWarner EFR twin-scroll turbocharger | |
Timing system | Dual roller chains (primary and secondary) | |
Oil type | Ford WSS-M2C949-B (5W-30) | |
Dry weight | 165 kg |
The Ford F4B was used across Ford's CX445 and CU285 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations-higher-capacity intercooler in Focus ST and revised throttle mapping in Puma ST-and from 2024 will see calibration updates for improved throttle response, creating minor ECU compatibility limits. All adaptations are documented in OEM technical bulletins.
The F4B's primary reliability risk is turbocharger wastegate actuator binding, with elevated incidence in stop-start urban use and high-temperature environments. Ford field reports from 2024 noted minor warranty claims related to boost control faults, while U.K. DVSA data shows low overall failure rates. Frequent short trips and failure to allow turbo cooldown increase stress, making driving pattern and oil maintenance critical.
Analysis derived from Ford technical bulletins (2023–2024) and U.K. DVSA failure statistics (2023–2024). 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 F4B is a new-generation engine with strong initial reliability. No major design flaws have been reported since its 2023 launch. Early field data from Ford and DVSA indicate low failure rates. Long-term durability depends on proper maintenance, especially oil changes and use of high-quality fuel. The twin-scroll turbo design is robust but benefits from cooldown periods after high-load driving.
The most documented issues are turbo wastegate actuator binding, high-pressure fuel pump wear, and intake carbon buildup. Minor oil leaks from valve covers have also been reported. These are addressed in Ford service bulletins and are typically manageable with proper maintenance. No widespread timing or head gasket issues have emerged.
The F4B is currently used in the 2023 Ford Focus ST and the 2024 Puma ST. It replaces the previous 2.3L EcoBoost in the ST lineup for improved thermal efficiency and broader torque delivery. The engine is primarily available in European markets as of 2025. No licensing to other manufacturers has been documented.
Yes. The F4B responds well to ECU tuning. Stage 1 remaps typically yield +30–45 kW safely, leveraging the robust twin-scroll turbo setup. Supporting modifications like intercooler upgrades and exhaust systems allow higher gains. Ford's calibration leaves room for tuning, but exceeding safe limits may stress the fuel system or trigger knock. Always use 98 RON fuel when tuned.
In the Focus ST, official combined consumption is ~9.2 L/100 km (~31 mpg UK). Real-world highway driving can achieve ~7.8 L/100 km (~36 mpg UK), while city use may exceed 11 L/100 km (~26 mpg UK). The Puma ST variant is slightly less efficient due to weight and gearing. Cylinder deactivation helps reduce consumption during light load.
Yes. The F4B is an interference engine, meaning piston-to-valve contact will occur if timing is lost. A timing chain failure could result in severe internal damage. The dual roller chain system is robust, but any unusual noise from the front cover should prompt immediate inspection to prevent costly repairs.
Ford specifies WSS-M2C949-B (5W-30) synthetic oil, equivalent to ACEA C5 and API SP. Oil changes should occur every 15,000 km or 12 months. Using the correct oil ensures proper turbo bearing lubrication, VCT operation, and piston cooling. Non-compliant oils may lead to deposit formation or component wear.
Comprehensive technical documentation and regulatory references
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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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