The Peugeot EP6CDTX is a 1,598 cc, inline‑four turbocharged petrol engine produced between 2014 and 2021. It features an all — aluminium block and head, DOHC valvetrain with variable valve timing (VVT), and direct fuel injection, delivering a blend of performance and efficiency. Peak power output is 151 kW (205 PS), with torque peaking at 300 Nm, enabled by its twin — scroll turbocharger for strong mid — range response.
Fitted to performance — oriented models like the 308 GT…
Production years 2014–2021 meet Euro 6 emissions standards applicable at time of manufacture .
The Peugeot EP6CDTX is a 1,598 cc inline‑four turbocharged 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 responsive performance. Designed to meet stringent Euro 6 emissions standards, it incorporates a gasoline particulate filter for 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 | High-pressure direct injection (Bosch HDEV5) | |
Emissions standard | Euro 6 | |
Compression ratio | 9.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Twin-scroll (Honeywell) | |
Timing system | Chain-driven | |
Oil type | Synthetic 5W‑30 (PSA B71 2290 specification) | |
Dry weight | 125 kg |
The Peugeot EP6CDTX was used across PSA's EMP2 platform with transverse mounting. This engine received minimal platform-specific adaptations-consistent ancillary placement across the 308 and RCZ-and no significant facelift revisions occurred during its production, ensuring broad parts interchangeability. All applications are documented in PSA technical bulletins.
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The EP6CDTX's primary reliability risk is carbon buildup on intake valves, with elevated incidence in vehicles subjected to frequent short trips. PSA technical notes indicate a correlation between low annual mileage and required induction cleaning frequency, while owner reports frequently cite turbocharger actuator failures. Use of lower-grade fuel and infrequent high-RPM operation make preventative maintenance critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 EP6CDTX is a high-performance engine that can be reliable with meticulous maintenance. Its main Achilles' heel is carbon buildup on the intake valves, which requires periodic cleaning. Using premium fuel, adhering to strict oil change intervals, and occasional high-RPM runs are crucial for longevity. Many well-maintained examples exceed 150,000 km without major issues.
The most frequent issues are carbon buildup on intake valves causing running problems, failures of the turbocharger's electronic wastegate actuator, and wear of the hydraulic engine mounts. Less common but critical is high-pressure fuel pump failure. These are well-documented in PSA service information.
The EP6CDTX code specifically refers to the high-output 1.6L turbo petrol found in the Peugeot 308 GTi 270 (2015-2021) and the Peugeot RCZ R (2014-2015). It is the most powerful variant of the widely used Prince engine family, co-developed by PSA and BMW.
Aftermarket ECU tuning is common on the EP6CDTX platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
As expected for a performance engine, economy is modest. In a 308 GTi, expect real-world figures of approximately 8.5-10.5 L/100km (27-22 mpg UK) combined. Economy is highly dependent on driving style; aggressive driving will see consumption rise significantly, while gentle cruising can yield better results.
Yes. The EP6CDTX is an interference engine. If the timing chain were to fail or jump, the pistons will contact the valves, causing catastrophic internal damage. This underscores the importance of using the correct specification oil and adhering to maintenance schedules to ensure chain longevity.
PSA mandates a fully synthetic 5W-30 engine oil meeting the PSA B71 2290 specification (which aligns with ACEA C2). Using the correct low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is critical to protect the turbocharger, timing chain, and the gasoline particulate filter (GPF) from premature wear or blockage.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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