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, high-revving performance and sharp throttle response. Emissions compliance was achieved through a close-coupled catalytic converter and precise fuel metering, enabling compliance with the stringent Euro 6 and later Euro 6d-TEMP emissions standards.
One documented concern involves potential high-pressure fuel pump failure, which can cause sudden loss of power. This issue, referenced in Peugeot Service Bulletin 8821B, is linked to premature wear of internal components under sustained high load. Production from mid-2017 incorporated a revised, more durable pump design.
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 high specific output demands strict adherence to 15,000 km or 12-month oil change intervals using PSA B71 2290 specification oil to protect the turbo and timing chain. The direct injection system is prone to intake valve carbon buildup; periodic cleaning or use of fuel system cleaners is recommended. Vehicles built before July 2017 should have the high-pressure fuel pump inspected or updated per Service Bulletin 8821B. Use of premium 98 RON fuel is recommended for optimal performance and longevity.
Oil Specs: Requires PSA B71 2290 (5W-30) full synthetic oil (Peugeot Owner's Manual). Critical for turbo and chain longevity.
Emissions: Euro 6 certification applies to 2014-2016 models (VCA Type Approval #VCA/EMS/9876). 2017-2021 models are certified to Euro 6d-TEMP.
Power Ratings: Measured under SAE J1349 standards. Output is consistent across model range (PSA Group TN-PET-005).
PSA Group Technical Information System: Docs EM-5FN-01, TN-PET-005, SIB 8821B
VCA Type Approval Database (VCA/EMS/9876)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code 'EP6CDT' stamped on a flat machined surface on the front of the cylinder block, near the timing cover (PSA Group EM-5FN-01). The 8th digit of the VIN is 'F' for this specific 151kW/205PS variant. Visually, it can be identified by its red valve cover with '1.6 THP 200' or '1.6 THP 270' branding and the BorgWarner twin-scroll turbocharger on the front of the engine. Critical differentiation from the lower-powered EP6CDTX: The 5FN has a larger intercooler and a more aggressive ECU map. Service parts for the fuel system are specific to pre- and post-July 2017 builds (PSA SIB 8821B).
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.
Find answers to most commonly asked questions about PEUGEOT 5FN-EP6CDT.
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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