The Citroën 4HX (engine code DW12TED4) is a 2,179 cc, inline — four turbo — diesel engine produced between 2008 and 2018. It features a cast — iron block, aluminium head, and common — rail direct injection, delivering 110 kW (150 PS) at 3,750 rpm and 340 Nm of torque at 2,000 rpm. With a variable geometry turbocharger (VGT), DOHC valvetrain, and exhaust gas recirculation (EGR), it was engineered for strong low — end pulling power and smooth performance in larger vehicles.
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Production years 2008–2018 meet Euro 5 standards; certain export variants comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/7842).
The Citroën DW12TED4 is a 2,179 cc inline-four turbo-diesel engine engineered for executive sedans and large hatchbacks (2008–2018). It combines common-rail injection with a variable geometry turbocharger to deliver robust torque and refined performance. Designed to meet Euro 5 standards, it balances power with emissions compliance in sustained highway driving.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,179 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 89.0 mm × 88.0 mm | |
Power output | 110 kW (150 PS) @ 3,750 rpm | |
Torque | 340 Nm @ 2,000 rpm | |
Fuel system | Common-rail direct injection (Delphi HDP6, up to 1,800 bar) | |
Emissions standard | Euro 5 (2008–2018) | |
Compression ratio | 16.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Variable geometry turbo (IHI RHF5) | |
Timing system | Timing belt (DOHC, front-mounted) | |
Oil type | Total Rubia TIR 5W-30 (PSA B71 2310) | |
Dry weight | 172 kg |
The Citroën 4HX (DW12TED4) was used across Citroën's C/D platforms with transverse mounting and shared with Peugeot under PSA Group standardization. This engine received platform-specific calibrations—tuned idle control in the C6 and revised intake tuning in the C5—and from 2012, Euro 5-compliant variants featured updated ECU mapping and DPF regeneration logic, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The DW12TED4's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in vehicles using non-EN 590 diesel. PSA internal field reports from 2015 indicated a significant share of pre-2012 units required HPFP replacement before 150,000 km, while UK DVSA data shows increased fuel system-related MOT failures in older examples. Extended service intervals and poor fuel quality exacerbate wear, making proactive maintenance critical.
Analysis derived from PSA technical bulletins (2010–2016) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
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The DW12TED4 is generally reliable with proper maintenance, but pre-2012 models have a known high-pressure fuel pump wear issue. Later revisions (2012+) with improved pump materials and filtration show better durability. Regular oil changes with PSA B71 2310-compliant oil, timely timing belt replacement every 120,000 km, and periodic highway driving to support DPF regeneration are essential for long-term reliability.
The most documented issues are high-pressure fuel pump wear (especially in 2008–2011 models), timing belt failure due to missed service intervals, DPF clogging from urban use, and EGR valve coking due to short-trip driving. These are covered in PSA service bulletins and field reports.
This 2.2L diesel engine was used in the Citroën C5 (2008–2017), C6 (2008–2012), and Jumpy (2010–2018). It was also shared with Peugeot (407, 508) under PSA Group platform sharing. Euro 5 variants have consistent ECU calibrations and emissions hardware.
Yes. The DW12TED4 responds well to ECU remapping, with stage 1 tunes typically gaining +30–50 kW. The stock turbo and internals support moderate increases, but higher power levels require upgraded intercooling, fueling, and ignition components to maintain reliability. Tuning should preserve DPF and EGR functionality to avoid emissions-related faults.
In combined driving, the DW12TED4 averages 6.5–7.2 L/100 km (43–39 mpg UK). Real-world consumption varies with driving style—aggressive use may exceed 9 L/100 km, while steady motorway cruising can achieve ~5.8 L/100 km. Its strong low-end torque and efficient combustion contribute to excellent real-world economy.
Yes. The DW12TED4 is an interference engine, meaning a broken or slipped timing belt can result in piston-to-valve contact and severe internal damage. Given the 120,000 km service interval, it is critical to replace the belt, tensioner, and associated components on schedule to avoid costly engine repairs.
PSA specifies Total Rubia TIR 5W-30 (PSA B71 2310) or equivalent. Oil must be changed every 15,000 km or annually to protect the EGR, DPF, and high-pressure fuel system. Using non-compliant oil increases the risk of premature HPFP and EGR failure.
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
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