The Peugeot 5FN (EP6CDT) is a 1,598 cc, inline‑four turbo‑petrol engine produced between 2014 and 2021. It features direct fuel injection, a twin — scroll turbocharger, and dual overhead camshafts (DOHC) with variable valve timing. This engine delivers 151 kW (205 PS) and 300 Nm of torque, with the twin — scroll turbo providing strong, linear power delivery for responsive performance.
Fitted primarily to the Peugeot 308 II GTi and RCZ R, the 5FN was engineered for sporty, h…
Production years 2014–2016 meet Euro 6 standards; 2017–2021 models comply with Euro 6d-TEMP (VCA UK Type Approval #VCA/EMS/9876).
The Peugeot 5FN (EP6CDT) is a 1,598 cc inline‑four turbo‑petrol engineered for hot hatches and coupes (2014-2021). It combines direct fuel injection with a twin-scroll turbocharger to deliver high specific output and a broad torque curve. Designed to meet Euro 6 and Euro 6d-TEMP standards, it balances aggressive performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 77.0 mm × 85.8 mm | |
Power output | 151 kW (205 PS) | |
Torque | 300 Nm @ 1,900 rpm | |
Fuel system | Direct injection (up to 200 bar) | |
Emissions standard | Euro 6 (2014-2016); Euro 6d-TEMP (2017-2021) | |
Compression ratio | 9.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single twin-scroll turbo (BorgWarner) | |
Timing system | Chain-driven | |
Oil type | PSA B71 2290 (SAE 5W-30) | |
Dry weight | 125 kg |
The Peugeot 5FN (EP6CDT) was used in Peugeot's high-performance models with transverse mounting. This engine received model-specific adaptations-unique engine mounts, exhaust manifolds, and ECU calibrations for the 308 GTi and RCZ R-with a mid-cycle update in 2017 introducing the revised fuel pump. All adaptations are documented in OEM technical bulletins.
The 5FN (EP6CDT)'s primary reliability risk is high-pressure fuel pump failure on early builds, with elevated incidence in vehicles subjected to track use or aggressive driving. PSA internal data indicated a higher-than-expected failure rate for units produced before Q3 2017, while UK DVSA records show no significant pattern of emissions test failures for these models. Use of incorrect fuel and irregular maintenance cycles significantly increase the risk of major component failure.
Analysis derived from PSA Group technical bulletins (2014-2021) and UK DVSA failure statistics (2018-2024). 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 5FN is a high-performance engine that can be reliable with meticulous maintenance. Its main weakness is the high-pressure fuel pump on pre-mid-2017 models. With the revised pump, adherence to strict oil change intervals, use of premium fuel, and periodic intake cleaning, it can be a robust long-term engine for enthusiasts.
The most frequent issues are high-pressure fuel pump failures (early models), intake valve carbon buildup, turbo wastegate rattle, and timing chain tensioner wear. These are well-documented in PSA service bulletins, with specific part number updates available for the fuel pump.
This 1.6L turbo petrol engine was used exclusively in the high-performance variants: the Peugeot 308 II GTi (250 and 270 PS versions, 2015-2021) and the Peugeot RCZ R coupe (2014-2015). It was the most powerful iteration of the Prince engine family in Peugeot vehicles.
Yes, it has excellent tuning potential. A Stage 1 ECU remap can safely increase power to 240-260 PS. Stage 2 (with upgraded downpipe and intercooler) can reach 280-300 PS. The stock internals are strong, but beyond 300 PS, forged pistons and rods are recommended. Always use high-octane fuel.
Official combined figures are around 6.0-6.5 L/100km (47-43 mpg UK). Real-world economy varies: expect 8.0-10.0 L/100km (35-28 mpg UK) in spirited driving, dropping to 6.5-7.5 L/100km (43-38 mpg UK) on highway runs. Aggressive driving will significantly increase consumption.
Yes. Like virtually all modern engines, the 5FN is an interference design. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage requiring a full rebuild or replacement.
It requires a high-quality, full synthetic 5W-30 oil meeting the PSA B71 2290 specification. Using the correct oil is critical for protecting the turbocharger and timing chain. Change intervals should not exceed 15,000 km or 12 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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