The Peugeot 4HY (DW12UTED) is a 2,179 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features a 16‑valve DOHC layout, common rail direct injection, and a fixed‑geometry turbocharger. This engine was designed to offer a balance of power and refinement for Peugeot's larger vehicles, producing 120 kW (163 PS) and 340 Nm of torque, with the variable geometry turbocharger (VGT) enhancing low‑end responsiveness.
Fitted primarily to the 407 and 607 executive sedans and estates, the 4HY was engineered for relaxed, long‑distance cruising with strong mid‑range pull. Emissions compliance for its production period was achieved through an exhaust gas recirculation (EGR) system and a diesel particulate filter (DPF), enabling adherence to the Euro 4 standard across its core markets.
A documented reliability concern involves premature failure of the high‑pressure fuel pump, potentially leading to sudden engine cut‑out. This issue, referenced in PSA Group Service Bulletin 13B007, is often attributed to fuel contamination or inadequate lubrication. The pump design was revised in later production runs to improve durability.
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/PSA/4HY).
The Peugeot 4HY (DW12UTED) is a 2,179 cc inline‑four turbo‑diesel engineered for executive sedans and estates (2006-2010). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver strong, linear torque and refined highway performance. Designed to meet Euro 4 standards, it prioritises smooth power delivery for comfort-oriented driving.
| 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 | Siemens VDO common‑rail (up to 1,600 bar) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed‑geometry turbo (Garrett) | |
| Timing system | Belt‑driven (requires periodic replacement) | |
| Oil type | PSA B71 2290 (SAE 5W‑40) | |
| Dry weight | 185 kg |
The fixed-geometry turbo provides predictable, linear power ideal for motorway cruising but lacks the low-RPM punch of a VGT. Strict 20,000 km or 12-month timing belt replacement is mandatory to prevent catastrophic interference engine damage. PSA B71 2290 (5W-40) oil is critical for turbo and injector longevity. The Siemens VDO fuel pump is sensitive to fuel quality; only ultra-low-sulfur diesel (ULSD) meeting EN 590 standards should be used to prevent premature failure, as noted in PSA SIB 13B007. The DPF system requires regular highway driving for passive regeneration; frequent short trips can lead to blockages and expensive forced regenerations.
Oil Specs: Requires PSA B71 2290 specification (PSA Service Schedule). Equivalent to ACEA B4.
Emissions: Euro 4 certification applies to all 2006–2010 models (VCA Type Approval #VCA/PSA/4HY).
Power Ratings: Measured under ECE R85 standards. Output is consistent across model range (PSA Group PT-2008).
PSA Technical Repair Manuals: 4HY Engine Section
VCA Type Approval Database (VCA/PSA/4HY)
ACEA Oil Sequences: B4 Specification
The Peugeot 4HY (DW12UTED) was used across Peugeot's PF3 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 607-and no significant facelift revisions occurred during its production run, ensuring broad parts compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the gearbox flange (PSA Repair Manual 4HY). The 8th digit of the VIN is 'R' for this 2.2 HDi 163 engine variant. Visually, it can be identified by its black plastic rocker cover and the Garrett turbocharger mounted at the front of the engine. Critical differentiation from the smaller 2.0 HDi: The 4HY has a larger displacement (2179cc vs 1997cc) and a distinct intake manifold design. Service parts, particularly the timing belt kit, are specific to the 4HY and not interchangeable with other DW12 variants without verification.
The 4HY's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel. PSA internal data indicated a notable failure rate before 150,000 km in affected batches, while owner reports frequently cite sudden engine cut-outs. Fuel contamination and infrequent oil changes increase pump stress, making fuel quality and adherence to service schedules critical.
Analysis derived from PSA technical bulletins (2006-2010) and owner-reported failure data (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 4HY-DW12UTED.
Comprehensive technical documentation and regulatory references
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