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 thr…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 5FK (EP6CB) is a powerful and responsive engine, but its long-term reliability hinges on preventative maintenance. The biggest concern is carbon buildup on intake valves, which requires periodic cleaning. With strict adherence to oil changes using 5W-30 and timely replacement of ignition components, these engines can be very reliable and last well beyond 200,000 km.
The most frequent issues are carbon buildup on intake valves causing rough running, high-pressure fuel pump failures, electronic turbo actuator faults leading to boost issues, and ignition coil pack failures. These are well-documented in Peugeot service information and are common to many modern turbocharged direct-injection engines.
This 1.6L turbo petrol engine was used exclusively in higher-performance Peugeot models from the mid-2010s, including the 308 GT and GTi (2015-2021) and the 508 GT (2018-2021). It was not used in standard or lower-trim variants of these models.
Yes, significantly. The 5FK (EP6CB) responds extremely well to ECU remapping, with stage 1 tunes often yielding +30-40 kW and +50-80 Nm torque safely. The robust internals and capable twin-scroll turbo allow for substantial gains. Stage 2 modifications (downpipe, intercooler) can push power even higher, making it a popular choice for tuners.
Expect combined fuel economy of approximately 6.5-7.5 L/100km (43-38 mpg UK) in a Peugeot 308 GTi. Real-world figures vary greatly with driving style; aggressive driving will see consumption rise significantly, while gentle cruising can yield better results. The official figures are optimistic for spirited use.
Yes. The 5FK (EP6CB) is an interference engine. If the timing chain were to fail (a very rare occurrence) or if the cam timing is severely disrupted, piston-to-valve contact is possible, resulting in significant internal engine damage. The chain is designed for the engine's lifetime under normal conditions.
Peugeot mandates a 5W-30 synthetic oil meeting their specific 9736.B2 standard (or equivalent ACEA C2). Using the correct low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is critical for the longevity of the GPF. Change intervals should not exceed 20,000 km or 1 year.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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