The Peugeot 4HN (DW12MTED4) is a 2,179 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features a cast — iron block, aluminum cylinder head, common — rail direct injection, and a fixed — geometry turbocharger. In standard form, it delivered 120 kW (163 PS) and 340 Nm of torque, engineered for robust performance in larger Peugeot and Citroën SUVs.
Fitted primarily to the Peugeot 4007 and Citroën C — Crosser, the 4HN was designed for drivers needing stro…
Production years 2006–2010 meet Euro 4 standards exclusively .
The Peugeot 4HN (DW12MTED4) is a 2,179 cc inline‑four turbo‑diesel engineered for mid‑size SUVs (2006-2010). It combines a robust cast-iron block with common‑rail direct injection to deliver strong low‑end torque and towing capability. Designed to meet Euro 4 standards, it prioritizes durability for demanding usage profiles.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,179 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 96.0 mm | |
Power output | 120 kW (163 PS) | |
Torque | 340 Nm @ 2,000 rpm | |
Fuel system | Bosch CP3 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed-geometry turbo (Mitsubishi) | |
Timing system | Chain-driven | |
Oil type | PSA B71 2290 (SAE 5W‑40) | |
Dry weight | 185 kg |
The Peugeot 4HN (DW12MTED4) was used across PSA Group's SUV platforms with transverse mounting and shared with Mitsubishi. This engine received platform-specific adaptations-shared ECU mapping with the Citroën C-Crosser and unique engine mounts for the Peugeot 4007-with no significant facelift revisions during its production run. The engine is a derivative of the Mitsubishi 4N1 engine family, adapted for PSA's common-rail system. All adaptations are documented in OEM technical bulletins.
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The 4HN (DW12MTED4)'s primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel. PSA internal reports noted a significant number of pump failures under warranty, while owner feedback frequently cites fuel filter neglect as a contributing factor. Extended service intervals and contaminated fuel make adherence to OEM maintenance schedules critical.
Analysis derived from PSA technical bulletins (2007-2011) and owner-reported failure data (2010-2023). 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 4HN is a robust engine with a strong cast-iron block, making it durable for high mileage. Its main weakness is the high-pressure fuel pump, which can fail prematurely with poor fuel or neglected filters. With strict adherence to maintenance, especially using correct oil and fuel, it can be very reliable long-term.
The most frequent issues are high-pressure fuel pump failure, EGR system clogging, turbo actuator faults, and dual-mass flywheel wear. These are well-documented in PSA service bulletins and owner forums, with the fuel pump being the most critical concern.
This engine was used almost exclusively in the Peugeot 4007 (2007-2010) and its twin, the Citroën C-Crosser (2007-2010), both badged as HDi 163. It is a PSA adaptation of a Mitsubishi engine design for these specific SUV models.
Aftermarket ECU tuning is common on the 4HN-DW12MTED4 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Expect combined fuel economy of around 35-40 mpg (UK) or 7.0-6.0 L/100km in a Peugeot 4007. Real-world figures vary significantly with driving style and load; highway cruising can yield up to 45 mpg, while city driving may drop to 30 mpg.
Yes. Like most modern engines, the 4HN is an interference design. If the timing chain were to fail, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the chain is very robust and rarely fails if maintained.
Peugeot specifies oil meeting the PSA B71 2290 standard, typically a 5W-40 synthetic. Using the correct specification is vital for protecting the high-pressure fuel pump and ensuring proper lubrication of the turbocharger and timing chain.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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