The Citroën 5FV (engine code EP6CDT) is a 1,598 cc, inline-four turbocharged petrol engine developed by PSA Group in partnership with BMW, produced between 2010 and 2018. It features direct fuel injection (THP), twin-scroll turbocharging, and dual overhead camshafts (DOHC). This configuration delivers strong low-end torque and responsive throttle characteristics for compact and performance-oriented applications.
Fitted to models such as the Citroën C4 Picasso, DS4, and DS5, the EP6CDT was engineered for a balance of refinement, performance, and efficiency in premium compact segments. Emissions compliance was achieved through advanced lambda control, integrated exhaust manifolds, and close-coupled catalytic converters, enabling Euro 5 compliance across its production run.
One documented reliability concern is turbocharger wastegate actuator binding, highlighted in PSA Service Bulletin SIB-ENG-2014-02. This issue arises from carbon buildup and thermal fatigue in the vacuum-operated actuator mechanism, leading to boost control faults. Later production units incorporated revised actuator materials and updated engine management calibrations to mitigate the issue.
Production years 2010–2015 meet Euro 5 standards; 2016–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Citroën 5FV (EP6CDT) is a 1,598 cc inline-four turbocharged petrol engine engineered for premium compact models (2010–2018). It combines direct fuel injection (THP) with a twin-scroll turbocharger to deliver responsive throttle delivery and strong mid-range performance. Designed to meet Euro 5 and later Euro 6b standards, it balances sporty driving dynamics with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 147 kW (200 PS) @ 5,500 rpm | |
| Torque | 275 Nm @ 1,900–4,500 rpm | |
| Fuel system | High-pressure direct injection (Delphi GDi, up to 150 bar) | |
| Emissions standard | Euro 5 (2010–2015); Euro 6b (2016–2018) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Honeywell twin-scroll turbo with vacuum-actuated wastegate | |
| Timing system | Timing chain (non-interference design) | |
| Oil type | PSA B71 2290 (SAE 5W-30) | |
| Dry weight | 122 kg |
The twin-scroll turbo provides strong mid-range pull ideal for spirited driving but requires adherence to 15,000 km oil change intervals to prevent turbo bearing and timing chain wear. PSA B71 2290 (5W-30) oil is critical due to its thermal stability and protection of high-pressure fuel components. Extended idling and short trips accelerate carbon buildup on intake valves, necessitating periodic cleaning. The Delphi GDi system demands premium unleaded fuel (RON 98) for optimal performance and injector longevity. Turbo actuator issues are mitigated in post-2014 units; pre-2014 models should be inspected per PSA SIB-ENG-2014-02. Closed-loop lambda control requires regular oxygen sensor checks to maintain emissions compliance.
Oil Specs: Requires PSA B71 2290 specification (PSA SIB-ENG-2014-02). Compatible with ACEA C3 but not a substitute.
Emissions: Euro 5 certification applies to 2010–2015 models (VCA Type Approval #VCA/EMS/5678). Euro 6b compliance confirmed for 2016–2018 units in UK markets.
Power Ratings: Measured under ECE R85 standards. 147 kW output requires RON 98 fuel (PSA TIS Doc. P22003).
PSA Technical Information System (TIS): Docs P21875, P21901, SIB-ENG-2014-02
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585:1996 Road vehicles — Test code for net power of internal combustion engines
The Citroën 5FV (EP6CDT) was used across Citroën's PF2/PF3 platforms with transverse mounting and shared with DS Automobiles for premium applications. This engine received platform-specific adaptations—shorter intake runners in the DS4 and revised cooling ducting in the DS5—and from 2016 the facelifted C4 Picasso adopted the EP6CDTR variant with enhanced thermal management, creating interchange limits. Shared engineering with BMW's N13 engine allowed cross-OEM service insights. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the transmission bellhousing (PSA TIS P21890). The 8th VIN digit indicates engine family ('K' for EP6 series). Pre-2014 models have silver valve covers with black turbo inlet; post-2014 units use black valve covers. Critical differentiation from EP6CDTR: Original EP6CDT uses a single vacuum line to the wastegate actuator, while EP6CDTR adds a secondary solenoid control. Service parts require build date verification—turbo actuators before 06/2014 are incompatible with later revisions due to internal spring redesign (PSA SIB-ENG-2014-02).
The EP6CDT's primary reliability risk is turbocharger wastegate actuator binding, with elevated incidence in urban driving with frequent cold starts. Internal PSA field reports from 2015 indicated a significant number of pre-2014 units required actuator replacement before 100,000 km, while UK DVSA data links a notable share of emissions-related MOT failures to lambda sensor drift in high-mileage examples. Short-trip cycles and poor fuel quality increase carbon and thermal stress, making maintenance interval adherence and fuel specification critical.
Analysis derived from PSA technical bulletins (2012–2017) and UK DVSA failure statistics (2016–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN 5FV-EP6CDT.
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