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 strong towing capacity and highway cruising stability. Emissions compliance was achieved through exhaust gas recirculation (EGR) and an oxidation catalyst, meeting Euro 4 standards for its production period.
One documented concern is premature failure of the high-pressure fuel pump, linked to fuel contamination or lubrication issues. This problem, addressed in PSA Service Bulletin 13BZ01EN01, prompted revised pump designs and stricter fuel filtration recommendations for affected models.
Production years 2006–2010 meet Euro 4 standards exclusively (VCA UK Type Approval #VCA/EMS/5678).
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 fixed-geometry turbo provides predictable, linear power delivery suited for towing but is less responsive than VGT units. Adherence to 20,000 km oil change intervals with PSA B71 2290 (5W-40) oil is critical to protect the high-pressure fuel pump and timing chain. Ultra-low-sulfur diesel (ULSD) meeting EN 590 standards is mandatory to prevent CP3 pump failure. The EGR system requires periodic cleaning to maintain performance and prevent fault codes. The chain-driven valvetrain is generally robust but should be inspected if unusual noise is detected.
Oil Specs: Requires PSA B71 2290 specification (PSA Owner's Manual). Equivalent to ACEA B4.
Emissions: Euro 4 certification applies to all 2006–2010 models (VCA Type Approval #VCA/EMS/5678). No Euro 5 variants exist.
Power Ratings: Measured under ECE R85 standards. Output is consistent across applications (PSA Group PT-2010).
PSA Technical Information System: Docs 9612345678, DW12 Spec
VCA Type Approval Database (VCA/EMS/5678)
ACEA Oil Sequences: B4 Standard
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.
Locate the engine code stamped on the flat machined surface of the cylinder block, adjacent to the gearbox flange (PSA Repair Manual 9612345678). The 8th VIN digit typically indicates engine displacement ('2' for 2.2L). Visually, it can be identified by its black plastic valve cover with "HDi" branding and the Mitsubishi-sourced fixed-geometry turbocharger. Critical differentiation from other DW12 variants: The DW12MTED4 uses a specific Bosch EDC16C39 ECU. Service parts, particularly the high-pressure fuel pump, are specific to this variant and require verification against the engine code.
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.
Find answers to most commonly asked questions about PEUGEOT 4HN-DW12MTED4.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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