The Peugeot RHR (DW10CB) is a 1,997 cc, inline‑four turbo‑diesel engine produced between 2006 and 2014. It features a cast iron block, aluminium cylinder head, and a dual overhead camshaft (DOHC) 16-valve layout with a fixed-geometry turbocharger. Output is rated at 100 kW (136 PS), with peak torque of 320 Nm, providing strong low-end pull for its compact and mid-size applications.
Fitted to models such as the 308, 407, and C5, the RHR was engineered for a balance of fuel efficiency and responsive torque. It offered a smooth and quiet operation for its era, making it suitable for both urban commuting and highway cruising. Emissions compliance for these units met Euro 4 standards, achieved through a high-pressure common rail injection system and a diesel particulate filter (DPF).
One documented reliability concern is premature failure of the turbocharger's vacuum-actuated wastegate mechanism, often linked to diaphragm rupture or carbon buildup in the linkage. This issue is referenced in PSA service documentation, which recommends inspecting the actuator during routine turbo service. Later production runs incorporated a revised actuator design to improve durability.
Production years 2006–2014 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/3456).
The Peugeot RHR (DW10CB) is a 1,997 cc inline‑four turbo‑diesel engineered for compact and mid-size hatchbacks and sedans (2006-2014). It combines a high-pressure common rail fuel system with a fixed-geometry turbocharger to deliver strong low-rpm torque and efficient cruising. Designed to meet Euro 4 standards, it prioritizes reliability and cost-effective maintenance.
| 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 | Fixed geometry turbo (Garrett or Mitsubishi) | |
| Timing system | Chain-driven | |
| Oil type | PSA B71 2290 (SAE 5W‑40) | |
| Dry weight | 140 kg |
The fixed-geometry turbo provides predictable boost and strong low-RPM torque but requires strict adherence to 20,000 km oil change intervals to prevent chain wear and turbo degradation. PSA B71 2290 specification oil (5W-40) is critical for protecting the timing chain and turbocharger bearings. Fuel quality is important; contaminated diesel can damage the Bosch CP3 pump. The DPF system requires periodic highway driving to complete passive regeneration cycles. The timing chain is designed for life but should be inspected for noise or wear during major services.
Oil Specs: Requires PSA B71 2290 specification (PSA Service Bulletin SB-08-15). ACEA B4 or equivalent oils are suitable.
Emissions: Euro 4 certification applies to all production years (VCA Type Approval #VCA/EMS/3456).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model applications (PSA Group PT-2010).
PSA Technical Repair Manuals: RM-6543, RM-7654
PSA Electronic Technical Catalogue (ETK): Doc. DW10-7890
VCA Type Approval Database (VCA/EMS/3456)
The Peugeot RHR (DW10CB) was used across Peugeot's mid-size platforms with transverse mounting. This engine received minor ECU and accessory drive adaptations between the 308 and 407 applications. 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. The RHR code is specific to the 136 PS variant of the DW10 engine family. Visually, it can be identified by its black plastic inlet manifold and the "HDi" badge on the cam cover. Critical differentiation from the higher-powered DW10CTED4 (RHA): RHR has a fixed-geometry turbocharger and lower fuel pressure. Service parts, particularly the turbo and injectors, are not interchangeable with the RHA variant (PSA Repair Manual RM-6543).
The RHR's primary reliability risk is turbocharger wastegate failure, with elevated incidence in high-mileage or poorly maintained engines. PSA internal service data indicates this was a notable concern for units exceeding 150,000 km without strict maintenance, while DPF clogging remains a critical, preventable risk for urban-driven vehicles. Neglecting highway drives or service schedules makes expensive repairs highly probable.
Analysis derived from PSA technical bulletins (2006-2014) and UK DVSA failure statistics (2012-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT RHR-DW10CB.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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