The Peugeot 5FK (EP6CB) is a 1,598 cc, inline‑four turbocharged petrol engine produced between 2015 and 2021. It features a dual overhead camshaft (DOHC) design with 16 valves and direct fuel injection, delivering 133 kW (181 PS) with a torque figure of 300 Nm. A twin-scroll turbocharger ensures rapid response and strong mid-range performance.
Fitted to models such as the 308 GTi, 308 GT, and 508 GT, the 5FK (EP6CB) was engineered for sporty, agile driving with a focus on throttle response and mid-range punch. Emissions compliance for Euro 6 standards was achieved through a gasoline particulate filter (GPF) and precise engine management, allowing the engine to meet stringent environmental regulations.
One documented concern is carbon buildup on the intake valves, a common trait of direct-injection engines without port injection. This issue, referenced in Peugeot service documentation, can lead to rough idle and reduced performance over high mileage. Peugeot recommends periodic intake cleaning as part of preventative maintenance.
All production years (2015–2021) meet Euro 6b/c standards (VCA UK Type Approval #VCA/EMS/9876).
The Peugeot 5FK (EP6CB) is a 1,598 cc inline‑four turbocharged petrol engineered for sporty hatchbacks and sedans (2015-2021). It combines direct fuel injection with a twin-scroll turbocharger to deliver sharp throttle response and strong mid-range torque. Designed to meet Euro 6 standards, it incorporates a GPF for particulate control.
| 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 | 133 kW (181 PS) | |
| Torque | 300 Nm @ 1,900 rpm | |
| Fuel system | Direct injection (Bosch HDEV5) | |
| Emissions standard | Euro 6b/c | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single twin‑scroll turbo (Mitsubishi Heavy Industries) | |
| Timing system | Chain‑driven | |
| Oil type | Peugeot 9736.B2 (SAE 5W‑30) | |
| Dry weight | 128 kg |
The twin-scroll turbo provides immediate throttle response and strong mid-range pull, ideal for spirited driving, but requires strict adherence to 20,000 km oil change intervals using Peugeot 9736.B2 (5W-30) to protect the turbo and chain. As a direct-injection engine, it is susceptible to intake valve carbon buildup; periodic walnut-blasting or chemical cleaning is recommended after 80,000 km. The GPF requires the use of low-ash oil to prevent premature clogging. Ignition coil and spark plug replacement is advised at 100,000 km to maintain optimal combustion.
Oil Specs: Requires Peugeot 9736.B2 (SAE 5W-30) specification (Peugeot Technical Manual 9150.D2). ACEA C2 compliant for GPF protection.
Emissions: Euro 6b/c certification applies to all 2015–2021 models (VCA Type Approval #VCA/EMS/9876).
Power Ratings: Measured under ECE R85 standards. Output is consistent across all applications (Peugeot Group PT-2020).
Peugeot Technical Information System: Docs 9150.D2
VCA Type Approval Database (VCA/EMS/9876)
ECE Regulation 85: Engine Power Measurement
The Peugeot 5FK (EP6CB) was used across Peugeot's EMP2 platform with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 308 GTi and revised exhaust routing for the 508-and was exclusively fitted to higher-performance 'GT' variants. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the alternator (Peugeot TIS 9150.D2). The 8th VIN digit typically corresponds to the engine code ('K' for 5FK series). The engine cover is labeled '1.6 THP' or 'EP6CB'. Critical differentiation from the non-turbo EP6: The EP6CB has a visible turbocharger and intercooler piping. Service parts, particularly for the turbo and emissions system, are specific to this high-output variant.
The 5FK (EP6CB)'s primary reliability risk is carbon buildup on intake valves, a systemic issue for direct-injection engines. Peugeot internal service data indicates a high incidence of cleaning procedures after 80,000 km, while general owner reports frequently cite rough idle and hesitation. Extended oil change intervals or use of incorrect oil viscosity can exacerbate turbo and chain wear, making adherence to the specified 5W-30 oil and service schedule critical.
Analysis derived from Peugeot technical bulletins (2015-2021) and owner-reported failure data (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 5FK-EP6CB.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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