The Citroën 4HN, designated DW12MTED4, is a 2,179 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 120 kW (163 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, C6, an…
All production years (2008–2015) comply with Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/8892).
The Citroën DW12MTED4 is a 2,179 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 | 2,179 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 94.6 mm | |
Power output | 120 kW (163 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 | 185 kg |
The Citroën DW12MTED4 was used across Citroën's C5/C6/DS5 platforms with transverse mounting and front-wheel drive layout. This engine received platform-specific adaptations-shortened intake manifolds in the C6 and revised ECU mapping in the DS5-and from 2011 the updated C5 adopted revised emissions hardware, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The DW12MTED4'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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The DW12MTED4 offers solid low-end torque and reasonable reliability when properly maintained. Early models (2008–2010) are prone to high-pressure fuel pump failure, while all variants demand strict timing belt changes every 120,000 km. Well-maintained engines with revised components (post-2011) can achieve high longevity. Using correct oil (5W-30 ACEA C3) and avoiding low-fuel operation helps ensure reliability.
Key issues include premature HPFP failure (especially pre-2011), EGR valve clogging, timing belt failure due to missed intervals, and DPF regeneration problems. These are documented in PSA service bulletins and owner reports. Fuel system damage from pump failure is common if maintenance is delayed. Regular inspections and OEM-recommended servicing mitigate most risks.
The DW12MTED4 was used in mid-size and premium Citroën models: C5 2.2 HDi 160 (2008–2015), C6 2.2 HDi 160 (2009–2012), and DS5 2.2 HDi 160 (2011–2015). It was not used outside the Citroën lineup. Each model has unique ECU mapping and intake tuning, so direct swaps require compatibility checks.
Yes, though within limits. ECU remapping can yield +25–35 kW on optimized setups. Supporting mods like performance intercoolers and exhaust upgrades are common in enthusiast builds. However, the engine's DOHC 16-valve design allows moderate tuning. Over-tuning without fuel and cooling upgrades risks HPFP and turbo failure.
Excellent for a 2.2L diesel of its era. In a C5 2.2 HDi 160, consumption is ~7.4 L/100km (city) and ~5.3 L/100km (highway), or about 45 mpg UK combined. Real-world figures depend on load and driving style—expect 40–48 mpg (UK) under mixed conditions with careful driving.
Yes. The DW12MTED4 is an interference engine. If the timing belt fails or jumps, the pistons can strike the open valves, causing catastrophic internal damage. This makes adherence to the 120,000 km belt replacement interval absolutely critical. Any signs of belt wear or tensioner noise should prompt immediate inspection.
PSA specifies SAE 5W-30 oil meeting ACEA C3 standards. Synthetic oil is required. Change intervals should not exceed 15,000 km or 12 months. Proper oil selection ensures adequate HPFP lubrication and protects the DPF and SCR system, especially in pre-2011 engines with known fuel pump durability limitations.
Comprehensive technical documentation and regulatory references
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CITROEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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