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 engineered for refined, long-distance cruising with an emphasis on mid-range torque. Emissions compliance was achieved through cooled exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), allowing it to meet Euro 4 standards across its initial production, with later variants achieving Euro 5.
One documented reliability concern is premature failure of the high-pressure fuel pump, which can lead to a complete loss of power. This issue, referenced in PSA service bulletin SB-06-12, is often linked to fuel contamination or extended service intervals. The engine received minor updates before being superseded by newer, more efficient DW12 variants.
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 variable geometry turbo provides strong, linear torque ideal for highway driving but requires strict adherence to 20,000 km or annual oil change intervals to prevent turbo and EGR system issues. PSA B71 2290 (5W-30) oil is critical for protecting the high-pressure fuel pump and chain-driven timing system. Fuel quality is paramount; contaminated diesel is the primary cause of premature high-pressure pump failure per PSA SB-06-12. The DPF system requires regular highway driving cycles to regenerate effectively. EGR coolers should be inspected for internal leaks around 120,000 km.
Oil Specs: Requires PSA B71 2290 (5W-30) specification (PSA Service Bulletin SB-08-05). ACEA C3 is the minimum acceptable standard.
Emissions: Euro 4 certification applies to 2006–2009 models; Euro 5 applies to 2010–2013 models (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across all model applications (PSA Group PT-2021).
PSA Technical Information System: Docs TB-06-08, SB-06-12, SB-08-05
VCA Type Approval Database (VCA/EMS/6789)
EEC Directive 80/1269 Power Measurement Standards
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.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox bellhousing (PSA Repair Manual 407/508). The 8th VIN digit typically corresponds to the engine type ('S' for DW12 diesel variants in many markets). Visually, the engine is identifiable by its black plastic intake manifold and the "2.2 HDi" badge on the cam cover. Differentiation from petrol variants is clear: the DW12 has no spark plugs or ignition coils. Service parts are generally interchangeable between Peugeot 407, 607, 508, and Citroën C5 applications for this engine code.
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.
Find answers to most commonly asked questions about PEUGEOT 4HT-DW12BTED4.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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