The Ford STJA is a 1,499 cc, inline‑three turbo‑petrol engine produced between 2018 and 2024. It features a DOHC 12‑valve layout, direct fuel injection, and a single twin‑scroll turbocharger. In standard form it delivers 118–140 kW (160–190 PS) with peak torque of 240–270 Nm, enabling brisk acceleration and responsive low‑end thrust.
Fitted to models such as the Fiesta ST, Puma ST, and Focus ST‑Line, the STJA was engineered for agile performance and everyday usability.…
Production years 2018–2020 meet Euro 6d TEMP standards; 2021–2024 models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/5678).
The Ford STJA is a 1,499 cc inline‑three turbo‑petrol engineered for compact performance hatchbacks (2018–2024). It combines direct injection with a twin‑scroll turbocharger to deliver responsive torque and sporty acceleration. Designed to meet Euro 6d TEMP and Euro 6d emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,499 cc | |
Fuel type | Petrol (ULP 95 RON min) | |
Configuration | Inline‑3, DOHC, 12‑valve | |
Aspiration | Turbocharged (twin‑scroll) | |
Bore × stroke | 82.0 mm × 94.0 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 (2021–2024) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled with electric auxiliary pump | |
Turbocharger | Single twin‑scroll (Honeywell Garrett) | |
Timing system | Chain‑driven (front‑mounted, maintenance‑free design) | |
Oil type | Ford WSS‑M2C948‑B1 (SAE 0W‑20) | |
Dry weight | 112 kg |
The Ford STJA was used across Ford's B‑Car and C‑Car platforms with transverse mounting. This engine received platform-specific adaptations—reinforced mounts in the Fiesta ST and enhanced cooling in the Puma ST—and from 2021 the Focus ST-Line adopted a revised intake manifold with acoustic tuning, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The STJA's primary reliability risk is high-pressure fuel pump (HPFP) cam follower wear in early builds, with elevated incidence in sustained high-load or track use. Ford internal data (2021) indicated a measurable uptick in HPFP-related warranty claims for 2018–2020 Fiesta STs before 80,000 km, while UK DVSA records show minimal emissions-related failures due to robust GPF control. Extended high-RPM operation without cooldown increases thermal stress on the pump drive mechanism, making fuel quality and driving pattern critical.
Analysis derived from Ford technical bulletins (2018–2024) and UK DVSA failure statistics (2019–2023). 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 STJA is generally robust when maintained properly. Early models (2018–2020) had HPFP concerns, largely resolved by 2021 updates. Cylinder deactivation and GPF systems work well with correct oil and driving habits. Using 95+ RON fuel and adhering to service intervals ensures longevity.
Top issues include HPFP cam follower wear (pre-2021), cylinder deactivation solenoid faults, GPF regeneration failures from short trips, and occasional turbo wastegate rattle. All are documented in Ford service bulletins and often preventable with proper maintenance.
The STJA powers the Fiesta ST (2018–2023), Puma ST (2020–2024), and Focus ST-Line 1.5L (2019–2024). It is exclusive to Ford’s transverse B- and C-platform performance variants and is not used in commercial or non-European models.
Yes. Stage 1 ECU remaps safely yield +20–30 kW by optimizing boost, timing, and CoD logic. The stock internals handle up to ~220 PS reliably. However, HPFP and fuel system upgrades are recommended beyond stage 1 to avoid rail pressure instability.
In a Fiesta ST, expect ~7.2 L/100km (city) and ~5.1 L/100km (highway), or ~40 mpg UK combined. Puma ST sees slightly higher consumption due to weight. Real-world mixed driving typically yields 38–44 mpg (UK) depending on driving style.
Yes. The STJA is an interference design. Timing chain failure (though rare) could cause piston-to-valve contact and severe internal damage. However, the chain is maintenance-free and highly durable under normal conditions.
Ford specifies 0W‑20 synthetic oil meeting WSS‑M2C948‑B1 standard. This low-viscosity oil is critical for cylinder deactivation function, turbo protection, and chain lubrication. Never substitute with 5W‑30 or non-approved oils.
Comprehensive technical documentation and regulatory references
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