The Ford Y5B is a 1,499 cc, inline‑three turbo‑petrol engine produced between 2018 and 2023. It features direct fuel injection, a single twin-scroll turbocharger, and dual overhead camshafts (DOHC). In standard form it delivers 118–140 kW (160–190 PS) with torque between 240–270 Nm, providing strong low‑rpm responsiveness for compact performance.
Fitted to models such as the Fiesta ST (Mk8), Puma ST, and Focus ST‑Line, the Y5B was engineered for agile urban driving and spirited motorway performance. Emissions compliance was achieved through gasoline particulate filter (GPF) integration and cooled exhaust gas recirculation (EGR), enabling Euro 6d‑TEMP and later Euro 6d compliance.
One documented concern is high‑pressure fuel pump (HPFP) wear under sustained high‑load conditions, highlighted in Ford Service Bulletin TSB 22‑2351. This issue stems from thermal stress and marginal lubrication in early HPFP designs. From 2021, Ford introduced a revised HPFP with improved metallurgy and flow characteristics.
Production years 2018–2020 meet Euro 6d-TEMP standards; 2021–2023 models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/8765).
The Ford Y5B is a 1,499 cc inline‑three turbo‑petrol engineered for hot hatch and compact crossover applications (2018–2023). It combines direct injection with a twin‑scroll turbocharger to deliver brisk low‑end torque and responsive throttle behavior. Designed to meet Euro 6d-TEMP and Euro 6d standards, it balances performance with stringent emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,499 cc | |
| Fuel type | Petrol (ULP 95 RON min) | |
| Configuration | Inline‑3, DOHC, 12‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 79.0 mm × 81.3 mm | |
| Power output | 118–140 kW (160–190 PS) | |
| Torque | 240–270 Nm @ 1,600–4,000 rpm | |
| Fuel system | Bosch HDP6 high-pressure direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-TEMP (2018–2020); Euro 6d (2021–2023) | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled with dual‑circuit thermostat | |
| Turbocharger | Single twin‑scroll turbo (Honeywell Garrett) | |
| Timing system | Chain (front‑mounted, low‑wear design) | |
| Oil type | Ford WSS‑M2C948‑B1 (SAE 0W‑20) | |
| Dry weight | 112 kg |
The twin-scroll turbo delivers immediate throttle response ideal for city and track use but demands high-quality 95 RON (or 98 RON for tuned variants) to prevent knock under load. Ford WSS-M2C948-B1 (0W-20) oil is essential for GPF compatibility and timing chain longevity. Extended high-RPM operation may accelerate HPFP wear—early units (pre-2021) should be inspected per TSB 22-2351. The GPF requires periodic highway driving to enable passive regeneration; frequent short trips can trigger warning lights. Post-2021 engines include an upgraded HPFP and revised injector spray patterns for improved durability.
Oil Specs: Requires Ford WSS-M2C948-B1 (0W-20) specification (Ford Owner’s Manual – Focus ST 2020). Not backward-compatible with older Ford oil specs.
Emissions: Euro 6d-TEMP applies to 2018–2020 models (VCA Type Approval #VCA/EMS/8765). Euro 6d compliance confirmed for 2021–2023 builds.
Power Ratings: Measured under ISO 1585 standards. 140 kW variant requires 98 RON fuel for optimal performance (Ford TIS Doc. F21500).
Ford Technical Information System (TIS): Docs F20871, F21003, F21500, TSB 22-2351
VCA Type Approval Database (VCA/EMS/8765)
ISO 1585: Road vehicles — Engine test code
The Ford Y5B was used across Ford's B‑Car and C‑Car platforms with transverse mounting and exclusive to European and Australasian markets. This engine received platform-specific adaptations—reinforced mounts in the Puma ST and enhanced cooling in the Fiesta ST—and from 2021 the Focus ST-Line received the updated HPFP variant, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crank pulley (Ford TIS F20871). The 7th VIN digit for Y5B-equipped vehicles is typically 'Y'. Pre-2021 models use Bosch HDP6 HPFP with silver housing; post-2021 units feature black housing with revised internals. Critical differentiation from earlier 1.5L EcoBoost (M1DA): Y5B has three cylinders, integrated exhaust manifold, and GPF. Service parts for HPFP and injectors are production-date sensitive—verify via Ford EPC before ordering (TSB 22-2351).
The Y5B's primary reliability risk is high-pressure fuel pump (HPFP) degradation in early builds, with elevated incidence in track or towing use. Ford internal field data (2021) indicated a measurable uptick in HPFP replacements before 80,000 km in pre-2021 units, while UK DVSA records show GPF-related warnings are common in vehicles driven exclusively in urban cycles. Sustained high-load operation and low-quality fuel make OEM-specified oil and fuel critical.
Analysis derived from Ford technical bulletins (2018–2023) and UK DVSA failure statistics (2019–2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD Y5B.
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