The Peugeot 4HR (DW12BTED4) is a 2,179 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features a DOHC 16‑valve design with common rail direct injection and a fixed‑geometry turbocharger. In standard applications, it delivers 120 kW (163 PS) and 340 Nm of torque, engineered for strong pulling power in larger Peugeot and Citroën vehicles.
Fitted primarily to the Peugeot 407, 607, and Citroën C5/C6, the 4HR was designed for refined, long‑distance c…
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Peugeot 4HR (DW12BTED4) 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 low‑rpm pulling power and smooth cruising. Designed to meet Euro 4 standards, it balances performance with acceptable fuel economy for its 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 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 | Chain (front‑mounted) | |
Oil type | PSA B71 2290 (SAE 5W‑40) | |
Dry weight | 185 kg |
The Peugeot 4HR (DW12BTED4) was used across PSA Group's PF3 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts for the 607 and specific ECU mapping for the C6-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
The 4HR's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel. Peugeot service data indicates a notable number of replacements under warranty, while owner reports frequently cite hard starting as a precursor. Extended service intervals and contaminated fuel make adherence to the correct oil specification and fuel quality critical.
Analysis derived from Peugeot technical bulletins (2008-2012) and UK DVSA failure statistics (2015-2023). 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 4HR is generally robust for long-term use if maintained correctly. Its main weakness is the high-pressure fuel pump, which can fail prematurely with poor fuel or infrequent servicing. The timing chain is durable. Using the correct 5W-40 oil and high-quality diesel is essential for maximizing longevity and avoiding costly repairs.
The most frequent issues are high-pressure fuel pump failures causing hard starting, EGR system clogging leading to rough running, and turbo actuator faults resulting in boost problems. Oil leaks from the rocker cover gasket are also common on higher-mileage engines. These are covered in Peugeot service documentation.
The 4HR (DW12BTED4) 2.2 HDi 163 engine was used in the Peugeot 407 and 607 sedans/estates from 2006 to 2010. It was also fitted to the equivalent Citroën models, the C5 and C6, during the same period. It was not used in smaller PSA vehicles like the 308 or 207.
Yes, the 4HR responds well to ECU remapping. Stage 1 tunes can safely increase power to around 185-200 PS and torque to 400+ Nm by adjusting boost and fueling. The stock internals are strong enough for these gains. More aggressive tuning requires supporting modifications like a larger intercooler and is not recommended for daily drivers.
Real-world fuel economy is respectable for a large diesel. In a Peugeot 407, expect around 7.5 L/100km (38 mpg UK) in combined driving. Highway cruising can yield 5.5-6.0 L/100km (47-51 mpg UK), while city driving may be 9.0-10.0 L/100km (28-31 mpg UK). Results vary significantly with driving style and vehicle condition.
Yes. The 4HR is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing catastrophic internal damage. Fortunately, the front-mounted chain is very reliable if the engine is properly maintained.
Peugeot mandates oil meeting the PSA B71 2290 specification, typically a 5W-40 synthetic. Using the correct oil is vital for protecting the high-pressure fuel pump and ensuring proper lubrication of the timing chain. Always change the oil and filter at the recommended 20,000 km intervals.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
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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.
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