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 Citroën C5, C6, and DS5, as well as the Peugeot 407 and 508, the DW10UTED4 was engineered for smooth long-distance performance and fleet durability. Emissions compliance was achieved through exhaust gas recirculation (EGR), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, meeting Euro 5 standards throughout its production run.
One documented concern is high-pressure fuel pump (HPFP) internal wear due to lubrication limitations, particularly in high-mileage or poorly maintained units. This issue, highlighted in PSA Service Bulletin SIB-ENG-2011-04, can lead to hard starting, power loss, and engine shutdown. From 2011, revised lubrication pathways and updated pump calibration were introduced to improve longevity in later production runs.
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 variable geometry turbo provides strong mid-range torque ideal for motorway cruising but requires adherence to 120,000 km timing belt intervals to prevent valve/piston contact. Total Rubia TIR 5W-30 oil is essential due to its low-SAPS formulation and compatibility with DPF/SCR systems. The Bosch HPFP demands ultra-low-sulfur diesel (EN 590) to prevent internal wear; contaminated fuel accelerates pump failure. SCR AdBlue injection reduces NOx emissions but requires periodic refilling. Post-2011 models feature revised fuel pump lubrication and enhanced EGR cooling, improving reliability. Cold-start idling should be minimized to reduce EGR soot buildup.
Oil Specs: Requires Total Rubia TIR 5W-30 or equivalent meeting PSA B71 2300. Supersedes ACEA C3.
Emissions: Euro 5 certification applies to all models (2008–2016) (VCA Type Approval #VCA/EMS/9234).
Power Ratings: Measured under ECE R85 standards. Output requires EN 590 diesel for optimal injection performance (PSA TIS DW-ENG-04).
PSA Technical Information System (TIS): Docs DW-ENG-01, DW-ENG-02, SIB-ENG-2011-04
VCA Type Approval Database (VCA/EMS/9234)
ISO 8854: Road vehicles — European emissions standards
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.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the exhaust manifold (PSA TIS DW-ENG-05). The 8th VIN digit indicates engine type ('U' for DW10UTED4). Pre-2011 models have silver injector bodies; post-2011 units feature updated pump lubrication. Critical differentiation: DW10UTED4 uses a Bosch CRS 2-20 common-rail system with SCR AdBlue injection, while the earlier DW10TD uses a Delphi system without SCR. Service parts require model-year verification—fuel pumps and ECUs from pre- and post-2011 builds are not interchangeable (PSA SIB-ENG-2011-04).
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.
Find answers to most commonly asked questions about CITROEN RHK-DW10UTED4.
Comprehensive technical documentation and regulatory references
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