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 ex…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 4HY offers strong performance and refinement but has known issues, primarily the high-pressure fuel pump. With meticulous maintenance, using high-quality fuel and oil, and adhering strictly to the timing belt schedule, it can be reliable. Later examples or those with the updated pump are generally more robust.
The most frequent issues are high-pressure fuel pump failure, EGR system clogging, turbocharger actuator faults, and DPF blockages. These are well-documented in PSA service bulletins and owner forums, often linked to maintenance or fuel quality.
This 2.2 HDi 163 engine was used exclusively in the Peugeot 407 (sedan and SW) and the Peugeot 607 (sedan) from 2006 to 2010. It was not shared with Citroën or other PSA brands in this specific DW12UTED configuration.
Yes, ECU remapping is common and can yield safe power gains of +20-30 kW. The engine's internals are robust. However, increased power puts more strain on the clutch, turbo, and fuel system, so supporting modifications and enhanced maintenance are recommended for stage 2+ tunes.
In a Peugeot 407, expect combined fuel economy of approximately 7.0 L/100km (40 mpg UK). Highway driving can return ~5.5 L/100km (51 mpg UK), while city driving may consume ~9.0 L/100km (31 mpg UK). Real-world figures vary significantly with driving style and DPF health.
Yes. The 4HY is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing catastrophic internal damage. This makes the 20,000 km/12-month timing belt replacement interval absolutely critical.
Peugeot mandates oil meeting the PSA B71 2290 specification, typically a 5W-40 synthetic. Using the correct oil is vital for protecting the turbocharger, high-pressure fuel pump, and emissions systems. Never use a lower specification oil.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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