The Peugeot 4HK (DW12ME5) is a 2,179 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features a robust cast — iron block, common rail direct injection, and a fixed — geometry turbocharger, delivering outputs between 120 kW (163 PS) and 130 kW (177 PS). Its high 16.6:1 compression ratio enables strong low — rpm torque for effortless towing and highway cruising.
Fitted primarily to the Peugeot 407 and 607 sedans, as well as the 807 MPV, the 4HK was enginee…
Production years 2006–2010 meet Euro 4 standards .
The Peugeot 4HK (DW12ME5) is a 2,179 cc inline‑four turbo‑diesel engineered for executive sedans and large MPVs (2006-2010). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver substantial low‑end pulling power and relaxed highway performance. Designed to meet Euro 4 standards, it prioritizes durability and torque for its vehicle class.
| 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 | 120–130 kW (163–177 PS) | |
Torque | 370–400 Nm @ 1,500–2,000 rpm | |
Fuel system | Siemens VDO common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.6:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | PSA B71 2290 (SAE 5W‑40) | |
Dry weight | 185 kg |
The Peugeot 4HK (DW12ME5) was used across Peugeot's PF3 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 807 and revised cooling ducting in the 607-with no significant facelift revisions during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 4HK is a robust engine with strong torque, but its Achilles' heel is the high-pressure fuel pump, particularly in early models or with poor fuel quality. With meticulous maintenance, use of correct oil (PSA B71 2290), and high-quality diesel, it can be very durable. Addressing EGR issues promptly is also key to long-term reliability.
The most frequent issues are high-pressure fuel pump failure (SIB 13BZ01A), EGR valve and cooler clogging, turbo actuator faults, and dual-mass flywheel wear. These are well-documented in Peugeot service bulletins and owner reports, with the fuel pump being the most critical concern.
This 2.2L HDi engine was used in the Peugeot 407 (sedan, SW, coupé), 607, and 807 MPV from 2006 to 2010. It was typically badged as 2.2 HDi 163, 170, or 177, depending on the power output and model year.
Aftermarket ECU tuning is common on the 4HK-DW12ME5 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.
Fuel economy is respectable for its size and power. In a Peugeot 407, expect around 7.5 L/100km (38 mpg UK) in combined driving. The heavier 607 and 807 will be closer to 8.5-9.5 L/100km (30-33 mpg UK). Real-world figures vary significantly with driving style and load.
Yes. Like virtually all modern DOHC engines, the 4HK is an interference design. If the timing chain fails or jumps, the pistons will collide with the open valves, causing catastrophic engine damage. Fortunately, the chain is generally reliable with proper oil changes.
Peugeot mandates oil meeting the PSA B71 2290 specification, typically a 5W-40 synthetic. Using the correct oil is crucial for protecting the turbocharger, timing chain, and especially the high-pressure fuel pump. Change intervals should not exceed 20,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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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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