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, D…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The EP6DTX delivers strong performance and responsive driving dynamics, but early models (2010–2013) had reliability concerns, particularly turbo wastegate actuator failure. Later revisions (post-2014) improved actuator durability, so well-maintained examples can be durable. Regular servicing, timely timing belt replacement, and using high-quality oil (5W-30 API SN) greatly enhance longevity.
The most documented issues are turbo wastegate actuator failure (especially pre-2014), timing belt failure due to deferred maintenance, intake carbon buildup, and catalytic converter clogging. These are well-documented in PSA service bulletins and technical reports. Proper maintenance significantly reduces failure risk.
The EP6DTX was primarily used in the Citroën C4 Picasso (2010–2018) and DS4 (2011–2015). It was also shared with Peugeot models like the 308 1.6 THP and 508 1.6 THP. All units are Euro 5 compliant, with post-2014 builds featuring improved turbo durability.
Yes. The DOHC 16V architecture and direct injection system allow effective ECU remapping. Tuning can yield gains of +30–40 PS with stage 1 software, as the stock turbo and internals handle increased torque. However, ensure cooling and fuel system integrity before tuning. Overloading without supporting mods increases wear risk.
Moderate. In a Citroën C4 Picasso 1.6 THP, typical consumption is ~9.2 L/100km (city) and ~6.1 L/100km (highway), or about 31–46 mpg UK. Real-world figures depend on driving style, but expect 36–42 mpg (UK) on mixed roads for a healthy engine.
Yes. The EP6DTX is an interference engine. If the timing belt fails, pistons can contact open valves, causing severe internal damage. Adhering to the 120,000 km or 6-year replacement interval is essential to prevent costly engine repairs.
PSA specifies SAE 5W-30 oil meeting API SN standards. Use a high-quality synthetic oil suitable for turbocharged petrol engines. Change oil every 15,000 km or annually to ensure proper lubrication, especially for turbocharger protection.
Comprehensive technical documentation and regulatory references
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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.
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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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