The Peugeot 4HL (DW12C) is a 2,179 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features a DOHC 16‑valve design with a variable geometry turbocharger (VGT) and high‑pressure common rail direct injection. Output ranges from 120 kW (163 PS) to 130 kW (177 PS), delivering peak torque of 370–400 Nm for strong low‑end pulling power ideal for larger vehicles.
Fitted primarily to the Peugeot 407 and 607 saloons, as well as the 807 MPV, the 4HL was engineer…
Production years 2006–2010 meet Euro 4 standards .
The Peugeot 4HL (DW12C) is a 2,179 cc inline‑four turbo‑diesel engineered for executive saloons and MPVs (2006-2010). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong, linear torque and refined cruising. Designed to meet Euro 4 standards, it balances performance with acceptable emissions for its era.
| 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 @ 2,000 rpm | |
Fuel system | Siemens VDO / Bosch common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | PSA B71 2290 (SAE 5W‑30) | |
Dry weight | 185 kg |
The Peugeot 4HL (DW12C) was used across Peugeot's PF3 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 807 MPV for load-bearing-and no significant facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
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The 4HL (DW12C)'s primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel. PSA internal reports indicated a notable failure rate before 150,000 km in early production batches, while owner feedback frequently cites sudden engine cut-outs. Extended periods of low-load driving and infrequent oil changes accelerate pump wear, making fuel quality and maintenance adherence critical.
Analysis derived from PSA technical bulletins (2007-2011) 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 4HL offers strong performance and refinement but has a known weakness with its high-pressure fuel pump, especially in early models. With meticulous maintenance, use of correct oil (PSA B71 2290), and high-quality fuel, it can be reliable. Addressing the fuel pump proactively or ensuring it's the revised version is key to long-term ownership.
The most frequent issues are high-pressure fuel pump failure, EGR system clogging, turbo actuator faults, and DPF regeneration problems. These are well-documented in PSA service bulletins and owner forums. Fuel pump failure is the most critical, often leading to sudden breakdowns.
The 4HL (DW12C) 2.2 HDi engine was fitted to the Peugeot 407 (sedan, SW), 607, and 807 MPV from 2006 to 2010. It was typically badged as the 2.2 HDi 163 or 2.2 HDi 170, depending on the power output and model year.
Aftermarket ECU tuning is common on the 4HL-DW12C 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.
Real-world fuel economy is respectable for its size. In a Peugeot 407, expect around 7.5 L/100km (38 mpg UK) in mixed driving. Highway cruising can yield 5.5-6.0 L/100km (47-51 mpg UK). City driving and DPF regeneration cycles will increase consumption significantly.
Yes. The 4HL (DW12C) is an interference engine. If the timing chain were to fail (though rare), the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the timing chain is very durable with proper oil changes.
Peugeot mandates the use of oil meeting the PSA B71 2290 specification, typically a 5W-30 synthetic. This low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is critical for protecting the DPF and catalytic converter from clogging and ensuring proper lubrication of the fuel system components.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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