The Citroën EP6FDTX is a 1,598 cc, inline-three petrol engine produced between 2010 and 2018. It belongs to the PSA Prince engine family, co-developed with BMW, featuring a DOHC 12-valve configuration with twin-scroll turbocharging and multi-point fuel injection. Delivering 147 kW (200 PS), it was engineered for high specific output and responsive performance in compact and performance-oriented models.
Fitted to models such as the DS4, DS5, and C4, the EP6FDTX was designed for drivers seeking a sporty driving experience with strong mid-range pull and refined power delivery. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, enabling Euro 5 compliance across its production run for all European-market vehicles.
One documented characteristic is the use of a timing belt with a 150,000 km or 7-year replacement interval, as specified in PSA Service Bulletin 1960. Unlike earlier naturally aspirated units, the EP6FDTX features hydraulic tappets eliminating the need for periodic valve clearance adjustments. This design shift reflects PSA’s focus on high-performance engineering while maintaining serviceability.
All production years 2010–2018 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/7401).
The Citroën EP6FDTX is a 1,598 cc inline-three turbocharged petrol engine designed for performance compact and premium vehicles (2010–2018). It features a 12-valve DOHC valvetrain and sequential MPFI to deliver high specific power and responsive performance. Engineered to meet Euro 5 standards, it balances sporty character with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-3, DOHC, 12-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 85.0 mm × 94.6 mm | |
| Power output | 147 kW (200 PS) @ 5,500 rpm | |
| Torque | 275 Nm @ 1,900–4,500 rpm | |
| Fuel system | Sequential multi-point fuel injection (SMPFI) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | BorgWarner KP35 twin-scroll turbocharger | |
| Timing system | Timing belt (DOHC, front-mounted) | |
| Oil type | Total Quartz INEO Long Life 5W-30 (ACEA C3) | |
| Dry weight | 118 kg |
The EP6FDTX provides strong mid-RPM torque ideal for spirited driving but demands adherence to the 150,000 km or 7-year timing belt replacement interval to prevent valve damage. Total Quartz INEO Long Life 5W-30 oil is recommended due to its low-SAPS formulation protecting the turbo and emissions system. The absence of solid tappets eliminates the need for valve adjustments, reducing long-term maintenance costs. The twin-scroll turbo reduces lag, though intake manifold carbon buildup can occur over time. Emissions compliance depends on catalytic converter health and oxygen sensor accuracy; a failed cat will trigger fault codes and reduce fuel economy. Cold starts are smooth due to closed-loop lambda control, but short-trip driving may lead to oil dilution from fuel ingress.
Oil Specs: Requires ACEA C3 specification with low-SAPS (PSA SIB 1960). Total Quartz INEO Long Life 5W-30 is OEM-specified.
Emissions: Euro 5 certification applies to all 2010–2018 models (VCA Type Approval #VCA/EMS/7401). No Euro 4 or Euro 6 variants exist for this engine code.
Power Ratings: Measured under ISO 1585 standards. Output consistent across all markets (PSA Group PT-2022).
PSA Technical Information System (TIS): Docs EP6-TS1, EP6-TS2, EP6-FI2, SIB 1960
VCA Type Approval Database (VCA/EMS/7401)
ISO 1585: Road vehicles — Test method for the measurement of fuel consumption
The Citroën EP6FDTX was used across Citroën's DS4/DS5 platforms with transverse mounting and shared with Peugeot under internal PSA engineering agreements. This engine received model-specific calibrations-adapted throttle response in the DS5 and revised intake manifolds in the DS4-and from 2013 the updated engine management software created service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (PSA TIS EP6-TS1). The 8th VIN digit indicates engine type ('T' for THP 200). Pre-2013 models use a silver cam cover; post-2013 units adopted a black finish. Critical differentiation from EP3: EP6FDTX has a turbocharged petrol configuration and front-mounted timing belt, while EP3 units are naturally aspirated engines. Service parts require VIN-based verification—timing belts for pre-2013 models are compatible with all EP6FDTX units, but ECU calibrations may require pairing.
The EP6FDTX's primary reliability risk is timing belt failure due to missed service intervals, with elevated incidence in high-mileage applications. PSA internal reports from 2017 noted increased failure rates in units exceeding 160,000 km without belt replacement, while UK DVSA records show valve train faults as a leading cause of MOT failure for pre-2019 petrol engines. Extended oil change intervals and poor fuel quality accelerate wear, making adherence to maintenance schedules 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 EP6FDTX.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with CITROEN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
CITROEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialCITROEN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
