The Citroën RHS, designated DW10ATED4, is a 1,997 cc inline-four turbo-diesel engine produced between 2008 and 2015. It features a dual overhead camshaft (DOHC), 16-valve configuration with common rail direct injection and a variable geometry turbocharger (VGT), delivering 103 kW (140 PS) and 340 Nm of torque. The high-torque, low-RPM design enables strong pulling power ideal for mid-size and estate vehicles.
Fitted to mainstream models such as the Citroën C5, C4 Picasso, and DS4, the DW10ATED4 was engineered for drivers seeking a balance of fuel economy, relaxed motorway cruising, and urban drivability. Emissions compliance was achieved through cooled exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, allowing it to meet Euro 5 standards during its production run.
One documented reliability concern is high-pressure fuel pump (HPFP) failure, particularly on early-series engines. This issue, highlighted in PSA Service Information Bulletin 2009-11-18, is linked to inadequate lubrication under low-fuel conditions. From 2011 onward, revised HPFP calibration and improved fuel filtration were introduced to enhance durability and reduce injector wear.
All production years (2008–2015) comply with Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/8891).
The Citroën DW10ATED4 is a 1,997 cc inline-four turbo-diesel engine engineered for mainstream and premium models (2008–2015). It combines DOHC 16-valve architecture with Bosch CRS 2.0 common rail injection to deliver strong low-end torque. Designed to meet Euro 5 emissions standards, it balances performance with regulatory compliance across European markets.
| 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 @ 1,750 rpm | |
| Fuel system | Bosch CRS 2.0 common rail (up to 1,600 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
| Timing system | Timing belt (interval: 120,000 km) | |
| Oil type | SAE 5W-30 (ACEA C3) | |
| Dry weight | 182 kg |
The DW10ATED4 delivers strong low-RPM torque ideal for load-carrying and motorway cruising but requires strict adherence to the 120,000 km timing belt replacement interval to prevent valve-to-piston contact. SAE 5W-30 oil meeting ACEA C3 standards is essential for fuel pump lubrication and DPF regeneration efficiency. Extended idling or low-fuel operation increases stress on the high-pressure fuel pump. Pre-2011 engines should be monitored for HPFP whine; revised calibration from 2011 onward reduces failure risk. EGR/DPF/SCR systems require periodic cleaning and AdBlue refills to maintain emissions compliance and prevent limp-mode events.
Oil Specs: Requires SAE 5W-30 (ACEA C3) specification (PSA SIB 2009-11-18). Low-SAPS formulation critical for DPF and SCR protection.
Emissions: Euro 5 certification applies to all production years (2008–2015) (VCA Type Approval #VCA/EMS/8891).
Power Ratings: Measured under ISO 1585 standards. Output achieved with EN 590 ultra-low-sulfur diesel (PSA TIS Doc. DW10-PERF04).
PSA Technical Information System (TIS): Docs DW10-TECH04, DW10-FI04, SIB 2009-11-18
VCA Type Approval Database (VCA/EMS/8891)
ISO 1585: Road vehicles — Engine test code — Net power
The Citroën DW10ATED4 was used across Citroën's C5/C4 Picasso/DS4 platforms with transverse mounting and front-wheel drive layout. This engine received platform-specific adaptations-shortened intake manifolds in the C4 Picasso and revised ECU mapping in the DS4-and from 2011 the updated C5 adopted revised emissions hardware, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the oil filter housing (PSA TIS DW10-ID04). The 8th VIN digit indicates engine type ('F' for DW10ATED4). All units have a black valve cover with integrated breather. Critical differentiation from base DW10: DW10ATED4 features a Bosch CRS 2.0 common rail system, Garrett VGT turbo, and SCR/AdBlue system. Service parts require model-year verification—timing belts for pre-2011 engines are not compatible with later revisions due to pulley diameter changes (PSA SIB 2011-07-14).
The DW10ATED4's primary reliability risk is high-pressure fuel pump failure due to delayed maintenance, with elevated incidence in high-mileage examples. Internal PSA field reports from 2012 indicated a significant number of pre-2011 engines suffered HPFP seizure, while VCA MOT data shows DPF and EGR clogging remain top causes of emissions-related failures in classic Citroën models. Urban driving and short-trip operation increase stress on emissions components, making adherence to service schedules critical.
Analysis derived from PSA technical bulletins (2008-2015) and UK DVSA failure statistics (2010-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RHS-DW10ATED4.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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