The Citroën 5FM (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…
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 5FM (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 Citroën 5FM (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.
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.
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The EP6CDT offers strong performance but pre-2014 models are prone to turbo actuator issues. Later revisions (post-2014) improved actuator durability, so well-maintained examples can exceed 150,000 km. Regular servicing, use of RON 98 fuel, and adherence to 15,000 km oil intervals with PSA B71 2290 oil are essential for longevity.
Key issues include turbo wastegate actuator binding, high-pressure fuel pump wear, intake valve carbon buildup, and timing chain tensioner rattle. These are documented in PSA service bulletins. Lambda sensor degradation and ECU software glitches are also reported in high-mileage units.
The EP6CDT was used in the Citroën C4 Picasso (B7) THP 200 (2010–2018), DS4 Performance Line (2011–2015), and DS5 petrol variants (2011–2015). It was also shared with Peugeot 308 GT models. All units from 2010–2015 met Euro 5; 2016–2018 models comply with Euro 6b.
Yes. The EP6CDT responds well to ECU remapping, with stage 1 tunes typically adding +30–40 kW. The turbo and internals support moderate increases, but supporting mods (intercooler, exhaust) are recommended. Tuning should preserve boost control calibration to avoid actuator stress.
In a C4 Picasso THP 200, combined consumption is ~7.8 L/100km (36 mpg UK). Real-world figures vary: city driving may see 9–10 L/100km, while highway runs can achieve 6.5 L/100km (43 mpg UK). Driving style and transmission type significantly influence economy.
No. The EP6CDT uses a non-interference timing chain design. If the chain skips or breaks, piston-to-valve contact is avoided, preventing catastrophic engine damage. However, replacement is still critical to maintain valve timing and prevent drivability issues.
PSA specifies 5W-30 oil meeting PSA B71 2290 standard. This synthetic oil is formulated for turbocharged direct-injection engines and must be used to protect the HPFP and turbo. Change every 15,000 km or annually to ensure optimal component life.
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