The Ford PRN is a 1,499 cc, inline‑three turbocharged petrol engine introduced in 2020 as part of Ford’s EcoBoost family. It features direct fuel injection, a single twin — scroll turbocharger, and dual overhead camshafts (DOHC). In standard tune it produces 110–125 kW (150–170 PS) with torque peaking at 240–270 Nm, offering responsive performance in compact applications.
Fitted primarily to the Puma ST and select Fiesta ST — Line derivatives, the PRN was engineered for…
All production years (2020–present) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9105).
The Ford PRN is a 1,499 cc inline‑three turbocharged petrol engineered for compact hatchbacks and crossovers (2020–present). It combines direct injection with a twin‑scroll turbocharger to deliver brisk low‑end response and smooth mid‑range pull. Designed to meet Euro 6d from launch, it balances performance with stringent particulate and NOx compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,499 cc | |
Fuel type | Petrol (Unleaded, min. 95 RON) | |
Configuration | Inline‑3, DOHC, 12‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.0 mm × 94.2 mm | |
Power output | 110–125 kW (150–170 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 (WLTP/RDE compliant) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled with electric auxiliary pump | |
Turbocharger | Single twin‑scroll (Honeywell/Garrett) | |
Timing system | Chain (front‑mounted, low‑maintenance design) | |
Oil type | Ford WSS-M2C948-B1 (SAE 0W‑20) | |
Dry weight | 113 kg |
The Ford PRN was used across Ford's B2 and C2 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Puma ST for NVH control and revised cooling ducts in the Fiesta ST-Line for urban thermal management—and from late 2022 the Puma ST adopted a higher-output calibration with unique exhaust tuning, creating ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The PRN's primary reliability risk is high-pressure fuel pump (HPFP) degradation under sustained high-load conditions, with elevated incidence in hot climates or frequent short-trip driving. Ford internal data from 2023 indicated a measurable uptick in HPFP warranty claims for pre-late-2022 builds, while UK DVSA records show GPF-related limp-mode events are rare but linked to chronic urban-only use. Extended idling and poor fuel quality accelerate wear, making fuel specification and driving pattern critical.
Analysis derived from Ford technical bulletins (2020–2024) and UK DVSA failure statistics (2021–2024). 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 PRN is generally robust when maintained properly and used with correct fuel. Early units (2020–late 2022) had HPFP concerns, largely resolved by late 2022 updates. Regular use of 95+ RON petrol, adherence to oil specs, and occasional highway driving for GPF regeneration ensure longevity.
Main issues include high-pressure fuel pump wear (pre-late-2022), GPF clogging from short trips, turbo wastegate rattle, and coolant leaks from the thermostat housing. These are documented in Ford service bulletins TSB-23-1142 and TSB-23-1150.
The PRN powers the Puma ST (2020+) and Fiesta ST-Line (2021–2023), across 155–200 PS variants. All are Euro 6d-compliant and feature GPF from launch. No cross-manufacturer usage is documented.
Yes. Stage 1 ECU remaps typically yield +20–30 kW safely due to robust internals and conservative factory tuning. However, HPFP and turbo durability become limiting factors beyond 220 PS. Always use 98 RON fuel and monitor GPF delta pressure post-tune.
In a Puma ST 1.5 EcoBoost 200, expect ~7.8 L/100km (city), ~5.4 L/100km (highway), or ~36 mpg UK combined. Real-world mixed driving typically returns 34–40 mpg (UK), depending on trim and driving style. GPF efficiency improves with consistent thermal cycles.
Yes. The PRN is an interference engine. Timing chain failure—though rare due to front-mounted design—could cause piston-to-valve contact. No widespread chain issues reported, but proper oil maintenance remains essential.
Ford specifies 0W-20 synthetic oil meeting WSS-M2C948-B1. This low-SAPS formulation protects the GPF and turbo bearings. Change intervals should not exceed 16,000 km or 12 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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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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GOV.UK: Vehicle Approval
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