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 agile urban driving and spirited weekend use. Emissions compliance is achieved through gasoline particulate filtration (GPF), cooled exhaust gas recirculation (EGR), and precise lambda control, meeting Euro 6d standards from launch.
One documented concern is premature wear of the high-pressure fuel pump (HPFP) under frequent high-load conditions, noted in Ford Service Bulletin TSB-23-1142. This stems from thermal stress and marginal fuel lubricity in low-quality petrol. Ford addressed it in late 2022 with revised pump internals and updated PCM calibration.
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 twin-scroll turbo provides immediate throttle response ideal for city agility, but sustained high-load operation (e.g., track use or mountain roads) can accelerate HPFP wear if fuel quality is substandard. Ford WSS-M2C948-B1 (0W-20) oil is essential for GPF compatibility and turbo bearing longevity. Use only EN 228-compliant 95 RON or higher petrol to prevent injector coking and HPFP failure. Post-late-2022 engines include updated pump internals per TSB-23-1142; earlier units benefit from updated PCM calibration during service visits. GPF regeneration is automatic but requires occasional highway driving to complete passive cycles.
Oil Specs: Requires Ford WSS-M2C948-B1 (0W-20) specification (Ford Owner’s Handbook 2021). Not backward compatible with older Ford oil specs.
Emissions: Euro 6d certification applies to all model years (2020–present) under VCA Type Approval #VCA/EMS/9105.
Power Ratings: Measured under UN ECE R85 standards. 125 kW variant requires 98 RON for optimal performance (Ford TIS Doc. P2230).
Ford Technical Information System (TIS): Docs P2215, P2220, P2230
Ford Service Bulletin TSB-23-1142
VCA Type Approval Database (VCA/EMS/9105)
UN Regulation No. 85 (Engine Power Measurement)
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.
Locate the engine code stamped on the front timing cover near the oil filler neck (Ford TIS P2218). The 7th VIN digit indicates engine family ('R' for PRN series). All PRN units feature a black plastic cam cover with 'EcoBoost' branding and a gasoline particulate filter (GPF) integrated into the exhaust manifold. Critical differentiation from PGFA: PRN uses distinct ECU calibration and higher-flow turbo in ST variants; PGFA lacks ST-specific tuning. ECU part numbers must match exact model/year—calibrations are not interchangeable between Puma ST and Fiesta without reprogramming (Ford SIB TSB-23-1142).
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.
Find answers to most commonly asked questions about FORD PRN.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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