The Citroen RHH (DW10CTED4) is a 1,997 cc, inline-four turbocharged diesel engine produced between 2008 and 2016. It features a DOHC 16-valve configuration with common rail direct injection and a variable geometry turbocharger (VGT), delivering 103 kW (140 PS) at 4,000 rpm and 340 Nm of torque at 1,750 rpm. Part of the PSA DW10 engine family, the DW10CTED4 was engineered for strong mid-range performance and fuel efficiency in mid-size and commercial platforms.
Fitted to models such as the Citroën C5, C6, and Peugeot 407, 508, the DW10CTED4 was designed for refined highway cruising and responsive urban driving. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, allowing Euro 5 compliance across its production run.
One documented reliability concern is high-pressure fuel pump (HPFP) failure, particularly under sustained high-load conditions or with poor fuel quality. This issue, referenced in PSA Service Information Bulletin SIB-ENG-2010-12, is linked to wear in the Delphi DCR pump plunger assembly. From 2011, revised HPFP internals and updated fuel filtration standards were introduced to improve durability and contamination resistance.
Production years 2008–2016 meet Euro 5 standards with SCR/AdBlue system (VCA UK Type Approval #VCA/EMS/7890).
The Citroen RHH (DW10CTED4) is a 1,997 cc inline-four turbocharged diesel engine engineered for mid-size and executive platforms (2008–2016). It combines common rail direct injection with a variable geometry turbocharger and SCR-based aftertreatment to deliver strong torque and emissions compliance. Designed to meet Euro 5 standards, it balances performance, refinement, and environmental requirements.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Diesel (ULSD, EN 590 compliant) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (variable geometry) | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 103 kW (140 PS) @ 4,000 rpm | |
| Torque | 340 Nm @ 1,750–2,500 rpm | |
| Fuel system | Delphi DCR common rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 (with SCR/AdBlue) | |
| Compression ratio | 16.4:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Honeywell variable geometry turbo (VGT) | |
| Timing system | Timing belt (renew every 120,000 km or 6 years) | |
| Oil type | Total Rubia TIR 5000 5W-30 | |
| Dry weight | 162 kg |
The variable geometry turbo provides strong low-RPM torque ideal for loaded driving but requires adherence to 120,000 km or 6-year timing belt replacement intervals to prevent valve damage. Total Rubia TIR 5000 5W-30 oil is critical due to its high-temperature stability and compatibility with the EGR, DPF, and SCR systems. Extended idling after high-load operation should be avoided to reduce heat soak in the turbocharger. The Delphi DCR fuel system demands ultra-low-sulfur diesel (EN 590) to prevent high-pressure pump wear. Post-2011 models feature improved HPFP internals; pre-2011 units benefit from upgraded fuel filters and regular system flushing. SCR/AdBlue system maintenance is essential to prevent limp-mode events and failed emissions tests.
Oil Specs: Requires Total Rubia TIR 5000 5W-30 specification (PSA SIB-ENG-2010-12). Compatible with ACEA B4 standards.
Emissions: Euro 5 certification applies to all 2008–2016 models (VCA Type Approval #VCA/EMS/7890). SCR system is mandatory for compliance.
Power Ratings: Measured under ISO 1585 standards. Output remains consistent across fuel grades due to closed-loop rail pressure control (PSA TIS Doc. B37210).
PSA Technical Information System (TIS): Docs B37000, B37120, SIB-ENG-2010-12
VCA Type Approval Database (VCA/EMS/7890)
ISO International: ISO 1585 Road vehicles — Passenger cars — Test method for the measurement of fuel consumption
The Citroen RHH (DW10CTED4) was used across Citroen's Platform 3 and Platform 4 with transverse mounting and shared extensively with Peugeot under PSA Group harmonisation. This engine received platform-specific adaptations-reinforced engine mounts in the C6 and revised ECU mapping in the Peugeot 508-and from 2011 the updated DW10B variant introduced improved fuel pump durability, 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 starter motor (PSA TIS B37050). The 8th VIN digit indicates engine type ('H' for DW10CTED4 series). Pre-2011 models have silver valve covers with black cam covers; post-2011 units use gloss black valve covers. Critical differentiation from DW10B: Original DW10CTED4 uses Delphi DCR ECU with circular connectors, while DW10B uses Siemens SID803 with rectangular connectors. Service parts require model year verification—fuel pumps for pre-2011 engines are not compatible with post-2011 variants due to internal revisions (PSA SIB-ENG-2010-12).
The DW10CTED4's primary reliability risk is high-pressure fuel pump failure on early builds, with elevated incidence in long-distance or poorly maintained vehicles. Internal PSA quality reports from 2012 indicated a notable share of pre-2011 engines required HPFP replacement before 120,000 km, while UK DVSA records link a significant portion of emissions-related MOT failures to EGR clogging in city-driven vehicles. Poor fuel quality and extended service intervals increase wear risk, making fuel filtration and oil quality critical.
Analysis derived from PSA technical bulletins (2008–2016) and UK DVSA failure statistics (2012–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RHH-DW10CTED4.
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