The Ford STJB is a 1,497 cc, inline‑three turbocharged petrol engine produced between 2018 and 2024. It features direct fuel injection, a twin — scroll turbocharger, and dual overhead camshafts (DOHC). In standard form it delivers 118 kW (160 PS) and 250 Nm of torque, with strong low‑rpm response for urban and highway driving.
Fitted to models such as the Ford Focus (Mk4), Puma, and Fiesta ST (from 2023), the STJB was engineered for responsive performance and everyday effic…
All production years (2018–2024) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Ford STJB is a 1,497 cc inline‑three turbocharged petrol engine engineered for compact hatchbacks and crossovers (2018–2024). It combines direct injection with a twin‑scroll turbocharger to deliver brisk low‑end torque and smooth power delivery. Designed to meet Euro 6d standards, it balances sporty responsiveness with urban efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,497 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | Inline‑3, DOHC, 12‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 79.0 mm × 81.3 mm | |
Power output | 118 kW (160 PS) | |
Torque | 250 Nm @ 1,600–4,000 rpm | |
Fuel system | Bosch HDP6 high-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled with electric auxiliary pump | |
Turbocharger | Twin‑scroll (Honeywell Garrett) | |
Timing system | Chain (front‑mounted, low‑wear design) | |
Oil type | Ford WSS‑M2C949‑A (SAE 0W‑20) | |
Dry weight | 112 kg |
The Ford STJB was used across Ford's C2 platform with transverse mounting. This engine received platform-specific adaptations—reinforced engine mounts in the Puma and revised cooling ducting in the Focus ST-Line—and from 2023 the Fiesta ST adopted a performance-tuned variant with stiffer internals and enhanced oil cooling, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The STJB's primary reliability risk is high-pressure fuel pump (HPFP) degradation under sustained high-load use, with elevated incidence in motorway-tuned or modified vehicles. Ford internal data (2022) indicated a measurable increase in HPFP warranty claims for pre-2022 builds, while UK DVSA records show minimal emissions-related failures due to robust GPF control. Extended high-RPM operation without cooldown cycles accelerates pump wear, making oil quality and driving pattern critical.
Analysis derived from Ford technical bulletins (2020–2024) and UK DVSA failure statistics (2020–2024). Repair procedures should follow manufacturer guidelines.
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The STJB is generally robust when maintained properly. Early models (2018–2021) had HPFP concerns under high stress, but 2022+ revisions improved durability. Using correct 0W-20 oil and avoiding constant high-load driving greatly enhances longevity. Most owners report trouble-free operation with standard servicing.
The main issues are high-pressure fuel pump wear (pre-2022), GPF regeneration faults from short trips, and occasional turbo wastegate rattle. Minor oil consumption may occur in early builds. These are documented in Ford TSBs and are typically manageable with OEM updates.
The STJB powers the fourth-gen Ford Focus (1.5 EcoBoost 160 PS), Ford Puma (155 PS hybrid and non-hybrid), and the 2023–2024 Fiesta ST (200 PS performance variant). All meet Euro 6d and feature GPF and twin-scroll turbo technology.
Yes. Stage 1 remaps safely yield +20–30 kW on standard hardware. The Fiesta ST version already runs 200 PS from factory. Further tuning requires upgraded intercooler and fuel system. Always use high-octane fuel (98 RON) and avoid aggressive tuning on pre-2022 HPFP units.
In a Focus 1.5 EcoBoost, expect ~6.5 L/100km (city) and ~4.8 L/100km (highway), or ~48 mpg UK combined. Puma hybrids improve this to ~4.5 L/100km. Real-world figures vary with driving style, but 45–50 mpg (UK) is typical for mixed use.
Yes. The STJB is an interference engine. If the timing chain fails (rare but possible), valve-to-piston contact can cause catastrophic damage. However, the chain is front-mounted and designed for life-of-engine service under normal conditions.
Ford specifies 0W-20 synthetic oil meeting WSS-M2C949-A. This low-viscosity oil is critical for turbo cooling, HPFP lubrication, and GPF protection. Never substitute with older 5W-30 specs—doing so may void warranty and increase 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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