The Peugeot EP6 is a 1,598 cc, inline‑four turbocharged petrol engine produced between 2006 and 2018. It features an aluminium block and head, DOHC valvetrain with variable valve timing (VVT), and direct fuel injection. Designed for compact and mid‑size models, it delivers a blend of performance and efficiency, with outputs ranging from 115 to 270 PS depending on the specific variant and state of tune.
Fitted to models such as the 207, 308, and RCZ, as well as Citroën DS3 and…
Production years 2006–2010 meet Euro 4 standards; 2011–2018 models meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/8765).
The Peugeot EP6 is a 1,598 cc inline‑four turbocharged petrol engineered for compact and sporty models (2006-2018). It combines direct fuel injection with variable valve timing (VVT) to deliver strong mid-range torque and efficient performance. Designed to meet Euro 4 and Euro 5 emissions standards, it balances spirited driving with everyday usability.
| 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 | 115–270 PS (85–199 kW) | |
Torque | 150–330 Nm @ 1,400–5,000 rpm | |
Fuel system | Gasoline direct injection (Bosch MED17) | |
Emissions standard | Euro 4 (2006–2010); Euro 5 (2011–2018) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single turbo (Mitsubishi TD04 or similar) | |
Timing system | Chain-driven (front-mounted; tensioner wear-prone) | |
Oil type | PSA B71 2290 (SAE 5W‑30) | |
Dry weight | 125 kg |
The Peugeot EP6 was used across Peugeot's PF1/PF2 platforms with transverse mounting and shared extensively with Citroën and MINI. This engine received platform-specific adaptations-different turbochargers and intake manifolds for the RCZ-and from 2012 the facelifted 308 II adopted revised engine management, creating minor interchange limits. Partnerships within the PSA Group and with BMW allowed Citroën DS3/DS4 and MINI to use variants of the engine. All adaptations are documented in OEM technical bulletins.
The EP6's primary reliability risk is timing chain tensioner wear on early builds, with elevated incidence in high-RPM or poorly maintained engines. PSA internal service data indicates this was a frequent cause of warranty claims for pre-2012 units, while UK DVSA records show a correlation between neglected oil changes and premature turbo failure. Aggressive driving and extended oil intervals increase stress on the chain and turbo, making adherence to service schedules critical.
Analysis derived from PSA technical bulletins (2008-2015) and UK DVSA failure statistics (2010-2020). 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 EP6 offers strong performance but early models (pre-2012) have a known weakness with the timing chain tensioner. Later revisions addressed this, and with meticulous maintenance—especially regular oil changes using the correct specification—the engine can be very reliable. Neglecting service is the primary cause of major failures.
The most frequent issues are timing chain tensioner wear (causing noise/failure), turbocharger failures (often from oil neglect), carbon buildup on intake valves (a trait of direct injection), and high-pressure fuel pump failures. These are well-documented in PSA service bulletins and owner reports.
The EP6 powered numerous Peugeot models including the 207, 308 I, and the sporty RCZ from 2006 to 2018. It was also used extensively in Citroën DS3 and DS4, and formed the basis for the BMW/PSA-developed engine found in the MINI Cooper S (R56/F56) of the same era.
Yes, the EP6 responds very well to tuning. A simple ECU remap can safely increase power by 20-40 PS on lower-spec variants. Higher-spec THP 200/270 engines can gain even more. Supporting modifications like an upgraded intercooler and exhaust are recommended for significant power gains to manage increased heat and stress.
Fuel economy varies by model and tune. A Peugeot 308 150 THP typically achieves 6.5 L/100km (43 mpg UK) combined. Higher-performance variants like the 200 THP will be thirstier, around 7.5 L/100km (38 mpg UK). Real-world figures are highly dependent on driving style due to the turbo's responsiveness.
Yes. The EP6 is an interference engine. If the timing chain fails or jumps, the pistons will collide with the open valves, causing catastrophic internal engine damage. This makes addressing any timing chain noise or tensioner issues immediately absolutely critical.
Peugeot mandates the use of PSA B71 2290 specification oil, typically a 5W-30 synthetic. This low-SAPS oil is crucial for protecting the timing chain tensioner and meeting emissions standards. Using the wrong oil can accelerate wear and lead to premature failure. Change intervals should not exceed 15,000 km or 1 year.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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