The Citroën RHK (DW10UTED4) is a 1,997 cc, inline — four turbocharged diesel engine produced between 2008 and 2016. It belongs to the PSA/Ford DW10 engine family, co — developed for transverse mounting in mid — size vehicles. Featuring a cast — iron block, aluminium head, and common — rail direct injection, it delivers strong torque and improved refinement over earlier HDi units. In standard tune, it produces 103 kW (140 PS) and 340 Nm of torque.
Fitted to models such as the Cit…
Production years 2008–2016 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/9234).
The Citroën RHK (DW10UTED4) is a 1,997 cc inline-four turbocharged diesel engine designed for mid-size executive vehicles (2008–2016). It combines common-rail injection with a variable geometry turbocharger to deliver responsive torque and improved efficiency. Designed to meet Euro 5 standards, it balances performance with emissions compliance and long-term reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,997 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 88.0 mm | |
Power output | 103 kW (140 PS) @ 4,000 rpm | |
Torque | 340 Nm @ 2,000 rpm | |
Fuel system | Bosch CRS 2-20 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 16.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Garrett VNT25 variable geometry turbo | |
Timing system | Rubber timing belt (interval: 120,000 km or 8 years) | |
Oil type | Total Rubia TIR 5W-30 | |
Dry weight | 158 kg |
The Citroën RHK (DW10UTED4) was used across Citroën's C/D-segment platforms with transverse mounting and shared with Peugeot under the DW engine program. This engine received platform-specific calibrations-adapted EGR flow in the C6 and revised SCR injection logic in the DS5-and from 2011 the facelifted C5 II adopted updated fuel pump lubrication and ECU mapping, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The DW10UTED4's primary reliability risk is high-pressure fuel pump failure on high-mileage or poorly maintained units, with elevated incidence in stop-start urban use. PSA internal quality reports from 2013 indicated a significant number of pre-2011 units requiring HPFP replacement before 150,000 km, while UK DVSA MOT records show increased emissions-related failures in short-trip examples. Extended service intervals and low-quality fuel accelerate degradation, making service adherence and fuel quality critical.
Analysis derived from PSA technical bulletins (2011–2016) and UK DVSA failure statistics (2014–2023). Repair procedures should follow manufacturer guidelines.
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The DW10UTED4 is generally reliable when maintained properly. Its common-rail design and proven architecture make it durable, but critical attention must be paid to the 120,000 km timing belt interval and fuel quality. HPFP failure is common on pre-2011 units. With timely servicing and use of correct oil (5W-30), these engines regularly exceed 200,000 km.
The most documented issues are high-pressure fuel pump failure due to wear, timing belt failure from missed services, and DPF clogging from short trips. These are addressed in PSA service bulletins, particularly SIB-ENG-2011-04. EGR fouling is also seen in high-mileage urban examples. Post-2011 models feature improved pump lubrication and reliability.
The DW10UTED4 was used in the Citroën C5 (2.0 HDi 140), C6 (2.0 HDi 140), and DS5 (2.0 HDi 140) from 2008 to 2016. It was also shared with Peugeot (407 2.0 HDi 140, 508 2.0 HDi 140) under the DW engine family. All applications are front-wheel drive with transverse engine mounting.
Yes. The DW10UTED4 responds well to ECU remapping, with stage 1 tunes typically gaining +25–35 kW. The Bosch common-rail system and Garrett turbo support moderate increases. Supporting mods (upgraded intercooler, exhaust) are recommended for sustained performance. However, over-tuning can accelerate HPFP and DPF issues, so conservative maps are advised.
In combined driving, expect 5.2–6.0 L/100 km (47–54 mpg UK). Real-world consumption is excellent in mixed driving (~5.5 L/100km), but urban use with DPF regeneration can exceed 7.0 L/100km. Highway efficiency improves to ~4.8 L/100km (59 mpg UK). Fuel quality and driving style significantly impact economy.
Yes. The DW10UTED4 is an interference engine. If the timing belt fails or jumps, piston-to-valve contact will occur, causing catastrophic internal damage. Given the 120,000 km service interval, proactive replacement of the belt, tensioner, and water pump is essential to avoid expensive repairs.
PSA specifies Total Rubia TIR 5W-30 (or equivalent meeting PSA B71 2300). This low-SAPS oil is essential for DPF and SCR system longevity. Oil must be changed every 15,000 km or annually to maintain lubrication and prevent soot buildup, especially in mixed driving conditions.
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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