The Peugeot 4HT (DW12BTED4) is a 2,179 cc, inline‑four turbo‑diesel engine produced between 2006 and 2013. It features a double overhead camshaft (DOHC) design, 16 valves, and a high — pressure common — rail fuel system. In standard form, it delivered 120 kW (163 PS) and 340 Nm of torque, with its variable geometry turbocharger (VGT) enabling strong low — rpm pulling power for effortless overtaking.
Fitted primarily to the Peugeot 407, 607, and later 508 models, the 4HT was e…
Production years 2006–2009 meet Euro 4 standards; 2010–2013 models meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/6789).
The Peugeot 4HT (DW12BTED4) is a 2,179 cc inline‑four turbo‑diesel engineered for executive and large family sedans (2006-2013). It combines a high-pressure common-rail injection system with a variable geometry turbocharger to deliver strong, sustained torque and quiet operation. Designed to meet Euro 4 and later Euro 5 standards, it balances performance with increasingly stringent emissions requirements.
| 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) @ 4,000 rpm | |
Torque | 340 Nm @ 2,000 rpm | |
Fuel system | Bosch high-pressure common-rail (up to 1,600 bar) | |
Emissions standard | Euro 4 (2006–2009); Euro 5 (2010–2013) | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable-geometry turbo (Garrett) | |
Timing system | Chain-driven | |
Oil type | PSA B71 2290 (SAE 5W‑30) | |
Dry weight | 178 kg |
The Peugeot 4HT (DW12BTED4) was used exclusively in PSA Group's large executive and family platforms with longitudinal mounting. This engine received minimal platform-specific adaptations and was shared directly between the Peugeot 407, 607, and 508. All adaptations are documented in OEM technical bulletins.
The 4HT (DW12BTED4)'s primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel or with extended service intervals. PSA internal data indicates a notable number of pump replacements before 120,000 km, while EGR cooler leaks become a common concern after 150,000 km. Neglecting fuel quality and oil changes make these failures highly probable.
Analysis derived from PSA technical bulletins (2006-2013) 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 4HT engine is generally robust, with a durable chain-driven timing system. Its main weakness is the high-pressure fuel pump, which is highly sensitive to fuel quality. With strict adherence to using high-quality diesel and changing the oil every 20,000 km, the engine can be very reliable. Neglecting these will almost certainly lead to expensive fuel system repairs.
The most frequent issues are high-pressure fuel pump failure, internal leaks in the EGR cooler, DPF blockage due to insufficient regeneration, and turbocharger wastegate actuator faults. These are well-documented in PSA service bulletins and owner reports.
The 4HT (DW12BTED4) 2.2L diesel engine was used in the Peugeot 407 (2006-2010), 607 (2006-2010), and 508 (2010-2013). It was also fitted to the Citroën C5 (2008-2010). It was not used in smaller Peugeot models like the 307 or 308, which used different engine families.
Yes, it is a popular candidate for tuning. ECU remaps can safely increase power to 140-150 kW (190-200 PS) and torque to 380-400 Nm by optimizing boost, fuel, and timing. The stock internals are generally strong enough to handle this. More substantial gains require upgraded turbos and injectors. Always ensure the DPF and EGR systems are functioning correctly before tuning.
Fuel economy is good for a large diesel car. Expect around 8.5 L/100km (33 mpg UK) in mixed driving and 6.0 L/100km (47 mpg UK) on the highway. Combined figures are typically around 7.0-7.5 L/100km (38-40 mpg UK), depending on the model, driving style, and whether the DPF is regenerating.
Yes. The 4HT (DW12BTED4) 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 engine damage. This underscores the importance of addressing any timing chain issues immediately.
Peugeot mandates the use of oil meeting the PSA B71 2290 specification, typically a 5W-30 low-SAPS (low ash) synthetic. Using the correct oil is critical for the longevity of the DPF and the high-pressure fuel system. ACEA C3 is the minimum acceptable industry standard if the PSA-specific oil is unavailable.
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.
VCA Certification Portal
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