The Peugeot RHY (DW10TD) is a 1,997 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features a dual overhead camshaft (DOHC) design with 16 valves and high — pressure common rail direct injection, delivering 100 kW (136 PS) and 320 Nm of torque. Its cast‑iron block and aluminium cylinder head construction provide a balance of durability and thermal efficiency for everyday driving.
Fitted to popular models like the 407, 607, and C5, the RHY engine was…
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5682).
The Peugeot RHY (DW10TD) is a 1,997 cc inline‑four turbo‑diesel engineered for mid-size sedans and estates (2006-2010). It combines DOHC 16-valve architecture with a fixed-geometry turbocharger and high-pressure common rail injection to deliver strong, accessible torque and efficient long-distance performance. Designed to meet Euro 4 standards, it integrates emissions after-treatment for regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,997 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 88.0 mm | |
Power output | 100 kW (136 PS) @ 4,000 rpm | |
Torque | 320 Nm @ 2,000 rpm | |
Fuel system | High-pressure common rail (Bosch CP3, up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed‑geometry turbo (Garrett) | |
Timing system | Chain-driven (front-mounted) | |
Oil type | PSA B71 2290 (SAE 5W‑40) | |
Dry weight | 155 kg |
The Peugeot RHY (DW10TD) was used across Peugeot's D-segment platforms with transverse mounting. This engine received platform-specific adaptations-different ECU mappings for the 407 and 607-and shared its core architecture with the Citroën C5. All adaptations are documented in OEM technical bulletins.
The RHY's primary reliability risk is EGR cooler failure, with elevated incidence in vehicles subjected to frequent short trips and thermal cycling. Internal PSA quality reports indicated a notable failure rate for coolers in early production, while UK DVSA data shows DPF-related issues as a leading cause of emissions test failure. Infrequent oil changes and low-quality fuel exacerbate wear, making adherence to service schedules critical.
Analysis derived from Peugeot technical bulletins (2007-2010) and UK DVSA failure statistics (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 RHY is generally robust but requires diligent maintenance, particularly for the EGR system and DPF. Engines that have been well-maintained with high-quality fuel and timely filter changes can be very reliable. Neglect, especially of the EGR cooler and DPF, leads to expensive failures.
The most critical issues are EGR cooler failure (leading to coolant contamination), DPF saturation, fuel injector failure, and turbo actuator wear. These are well-documented in Peugeot service bulletins and owner reports, often linked to driving patterns and fuel quality.
This 2.0L diesel engine was used in the Peugeot 407 (2006-2010), 607 (2006-2010), and was also shared with Citroën, appearing in the C5 (2006-2010) models, typically badged as 2.0 HDi 136.
Yes. The RHY responds well to ECU remapping, typically gaining 20-25 kW (27-34 PS) and improved torque. The stock internals and turbo are robust enough for moderate tuning. Pushing power significantly higher requires upgraded injectors and potentially a larger intercooler.
Fuel economy is excellent. In a Peugeot 407, expect around 6.0 L/100km (47 mpg UK) in combined driving. In the heavier 607, figures are closer to 6.5-7.0 L/100km (40-43 mpg UK). Real-world economy depends heavily on driving style and DPF regeneration cycles.
Yes. The RHY is an interference engine. If the timing chain fails or jumps teeth (though rare), the pistons will collide with the open valves, causing severe and expensive internal engine damage. Fortunately, the chain system is generally very durable.
Peugeot specifies oil meeting the PSA B71 2290 standard, typically a 5W-40 fully synthetic oil. Using the correct specification is vital for protecting the engine and ensuring proper lubrication of the turbocharger and chain.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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