The Citroën 5FU (engine code EP6DTX) is a 1,598 cc, inline — four turbocharged diesel engine developed by PSA Group, produced between 2012 and 2018. It features high — pressure common — rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC), delivering 88 kW (120 PS) and 300 Nm of torque. This configuration provides strong low — end pull ideal for urban and motorway driving.
Fitted to models such as the Citroën C4 Picasso, C3 Picass…
Production years 2012–2015 meet Euro 5 standards; 2016–2018 models comply with Euro 6c depending on market (VCA UK Type Approval #VCA/EMS/5679).
The Citroën 5FU (EP6DTX) is a 1,598 cc inline-four turbo-diesel engine engineered for compact and family vehicles (2012–2018). It combines common-rail injection with a variable geometry turbocharger to deliver responsive low-RPM torque and improved fuel economy. Designed to meet Euro 5 and Euro 6c standards, it balances efficiency with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (variable geometry turbo) | |
Bore × stroke | 77.0 mm × 85.8 mm | |
Power output | 88 kW (120 PS) @ 3,600 rpm | |
Torque | 300 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CRS 2-20 common-rail (up to 1,800 bar) | |
Emissions standard | Euro 5 (2012–2015); Euro 6c (2016–2018) | |
Compression ratio | 15.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Honeywell variable geometry turbo (VGT) with electronic actuator | |
Timing system | Timing belt (interference design) | |
Oil type | PSA B71 2310 (SAE 5W-30) | |
Dry weight | 135 kg |
The Citroën 5FU (EP6DTX) was used across Citroën's PF2/PF3 platforms with transverse mounting and shared with DS Automobiles for premium applications. This engine received platform-specific calibrations—higher EGR flow in the C3 Picasso and SCR integration in the DS4—and from 2016 the facelifted C4 Picasso adopted the Euro 6c-compliant EP6DTX variant with revised NOx sensors, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The EP6DTX's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in vehicles fueled at non-branded stations. Internal PSA field reports from 2016 indicated a notable number of pre-2015 units required HPFP replacement before 100,000 km, while UK DVSA data links a significant share of emissions-related MOT failures to EGR valve clogging in high-mileage examples. Short-trip cycles and poor fuel quality increase particulate 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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The EP6DTX offers strong fuel economy and refinement but is sensitive to fuel quality and maintenance. Pre-2015 models are prone to HPFP wear if low-quality diesel is used. Later revisions (post-2015) improved pump durability and SCR integration. Well-maintained examples with regular oil changes, quality fuel, and timely DPF regeneration can exceed 180,000 km.
Key issues include high-pressure fuel pump wear, EGR valve coking, DPF regeneration failure, and timing belt neglect. These are documented in PSA service bulletins. AdBlue system faults and NOx sensor degradation are also reported in high-mileage units. Cold-start hesitation may indicate injector wear.
The EP6DTX was used in the Citroën C4 Picasso (B7) BlueHDi 120 (2012–2018), C3 Picasso 1.6 HDi 120 (2012–2017), and DS4 1.6 BlueHDi (2012–2015). It was also shared with Peugeot 308 BlueHDi 120 models. All units from 2012–2015 met Euro 5; 2016–2018 models comply with Euro 6c.
Yes. The EP6DTX responds well to ECU remapping, with stage 1 tunes typically adding +20–30 kW. The turbo and fuel system support moderate increases, but supporting mods (intercooler, exhaust) are recommended. Tuning should preserve DPF and EGR functionality to avoid emissions-related faults.
In a C4 Picasso BlueHDi 120, combined consumption is ~4.1 L/100km (69 mpg UK). Real-world figures vary: city driving may see 5.0–5.5 L/100km, while highway runs can achieve 3.8 L/100km (74 mpg UK). Driving style and DPF regeneration frequency significantly influence economy.
Yes. The EP6DTX uses an interference timing belt design. If the belt skips or breaks, pistons can contact open valves, resulting in severe internal engine damage. Replacement every 5 years or 120,000 km is critical to prevent catastrophic failure.
PSA specifies 5W-30 oil meeting PSA B71 2310 standard. This synthetic oil is formulated for turbocharged diesel engines with DPF and SCR systems. Change every 15,000 km or annually to ensure optimal component life and soot management.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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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