The Citroën EP6DTX is a 1,598 cc, inline-four petrol engine produced between 2010 and 2018. It features a DOHC 16-valve configuration with turbocharging and direct fuel injection (THP), delivering 115 kW (156 PS) and 240 Nm of torque. Its compact turbocharged design and responsive power delivery made it ideal for compact and performance-oriented hatchbacks, offering strong low-end torque and refined driving dynamics.
Fitted to models such as the Citroën C4 Picasso, DS4, and Peugeot 308, the EP6DTX was engineered for balanced performance and efficiency. Emissions compliance was achieved through exhaust gas recirculation (EGR), catalytic converter integration, and lambda feedback control, allowing Euro 5 compliance across its production run. It served as PSA’s mainstream turbocharged petrol engine for transversely mounted front-wheel-drive platforms.
One documented concern is premature turbocharger wastegate actuator failure, particularly on high-mileage units, highlighted in PSA Service Bulletin SIB-ENG-11-005. This issue is linked to carbon buildup and mechanical wear in the actuator linkage under sustained high-temperature operation. Later revisions introduced revised actuator materials and ECU recalibration to reduce failure incidence in post-2014 builds.
All production years (2010–2018) meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/2346).
The Citroën EP6DTX is a 1,598 cc inline-four turbocharged petrol engine engineered for compact passenger vehicles (2010–2018). It combines DOHC 16-valve architecture with direct injection and turbocharging to deliver strong low-RPM torque and sporty responsiveness. Designed to meet Euro 5 emissions standards, it balances performance with urban drivability.
| 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 kW (156 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 1,400–4,000 rpm | |
| Fuel system | Bosch MED 17.5.5 direct injection | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Mitsubishi TD04HL-15T turbocharger with vacuum-actuated wastegate | |
| Timing system | Timing belt (interval: 120,000 km or 6 years) | |
| Oil type | SAE 5W-30, API SN | |
| Dry weight | 128 kg |
The DOHC 16V turbocharged design provides strong low-RPM torque ideal for spirited driving but demands adherence to 120,000 km (or 6-year) timing belt replacement intervals to prevent interference failure. SAE 5W-30 oil meeting API SN specs is critical for turbocharger and bearing protection, especially under sustained load. Extended idling or short trips may accelerate carbon buildup on intake valves. The Bosch MED 17.5.5 system requires periodic injector cleaning to maintain fuel atomization and idle stability. Early units (2010–2013) should verify wastegate actuator condition per PSA SIB-ENG-11-005; retrofit kits are available to prevent premature wear.
Oil Specs: Requires API SN 5W-30 specification (PSA SIB-ENG-11-005). Compatible with ACEA A5/B5 standards.
Emissions: Euro 5 certification applies to all 2010–2018 models (VCA Type Approval #VCA/EMS/2346).
Power Ratings: Measured under ISO 1585. Output maintained on 98 RON fuel (PSA TIS Doc. EP6DTX-ENG-004).
PSA Technical Information System (TIS): Docs EP6DTX-ENG-001, EP6DTX-ENG-002, SIB-ENG-11-005
VCA Type Approval Database (VCA/EMS/2346)
ISO 1585: Road vehicles — Methods of measurement of fuel consumption
The Citroën EP6DTX was used across Citroën's C4 Picasso and DS4 platforms with transverse mounting and shared within the PSA Group for compact applications in Peugeot and DS Automobiles models. This engine received platform-specific adaptations-shorter intake manifolds in the C4 Picasso and revised exhaust manifolds in the DS4-and featured consistent Euro 5 emissions compliance throughout production. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the right-side cylinder block near the transmission bellhousing (PSA TIS EP6DTX-ID-001). The 8th VIN digit indicates engine type ('P' for EP6 series). Pre-2014 models have silver cam covers with ribbed design; post-2014 units use black cam covers with smoother finish. Critical differentiation from EP6CDT: EP6DTX has 156 PS output with standard turbo, while EP6CDT is 175 PS with higher boost. Service parts require production date verification - wastegate actuators for pre-2014 engines are not compatible with post-2014 Euro 5 variants due to calibration differences (PSA SIB-ENG-11-005).
The EP6DTX's primary reliability risk is turbocharger wastegate actuator failure on high-mileage builds, with elevated incidence in hot climates or urban stop-start usage. PSA internal reports from 2013 noted a significant share of pre-2014 engines requiring actuator replacement before 150,000 km, while UK DVSA records link a notable portion of MoT failures to elevated hydrocarbon emissions due to degraded catalytic converters in high-mileage units. Sustained idling and deferred maintenance increase wear risk, making timing belt adherence and oil quality critical.
Analysis derived from PSA technical bulletins (2010-2018) and UK DVSA failure statistics (2011-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN EP6DTX.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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