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 engineered for refined cruising and strong low-end torque. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), allowing it to meet Euro 4 standards.
One documented concern is premature failure of the EGR cooler, which can lead to coolant contamination and white exhaust smoke. This issue, highlighted in Peugeot Service Bulletin 7018 B 07, is often linked to thermal cycling stress and internal corrosion. Peugeot addressed this by revising the cooler material and updating the EGR valve calibration in later production runs.
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 fixed-geometry turbo provides strong, predictable torque ideal for highway cruising but requires strict adherence to 20,000 km oil and fuel filter change intervals to protect the high-pressure fuel system. PSA B71 2290 (5W-40) oil is critical for protecting the turbocharger and chain system. The Bosch CP3 pump is sensitive to fuel contamination; using poor-quality diesel can lead to premature failure. The EGR cooler is susceptible to internal cracking; regular inspection and coolant changes are recommended per SIB 7018 B 07. DPF systems require periodic highway driving to maintain regeneration cycles.
Oil Specs: Requires PSA B71 2290 specification (Peugeot Owner's Manual). Equivalent to ACEA B4.
Emissions: Euro 4 certification applies to all 2006-2010 models (VCA Type Approval #VCA/EMS/5682).
Power Ratings: Measured under SAE J1349 standards. Output consistent across applications with correct fuel (EN 590) (Peugeot TIS Doc. M56789).
Peugeot Technical Information System (TIS): Docs M56789, M56790, SIB 7018 B 07
VCA Type Approval Database (VCA/EMS/5682)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox flange (Peugeot TIS M56789). The 8th VIN digit often corresponds to the engine type ('Y' for RHY in many 407/C5 models). Critical differentiation from the higher-output DW10ATED: RHY (DW10TD) has a fixed-geometry turbocharger and produces 136 PS, while the DW10ATED features a variable geometry turbo and 163 PS. Service parts, particularly EGR coolers and gaskets, require production date verification for compatibility (Peugeot SIB 7018 B 07).
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.
Find answers to most commonly asked questions about PEUGEOT RHY-DW10TD.
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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