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 eff…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The RHR can be very reliable long-term with meticulous maintenance. The critical factors are adhering to 20,000 km service intervals and ensuring the vehicle completes regular DPF regeneration cycles via highway driving. With proper care, these engines can exceed 200,000 km without major issues. Neglecting either can lead to expensive turbo or DPF repairs.
The top issues are turbocharger wastegate failure (due to diaphragm rupture or carbon buildup), DPF clogging (from short trips), EGR valve carbon buildup, and leaking injector seals. These are well-documented in PSA service information and owner reports. The timing chain is generally very robust.
The RHR was primarily used in the Peugeot 308 I (2.0 HDi 136), the Peugeot 407 (2.0 HDi 136), and the Peugeot Expert van. It was also fitted to the Citroën C5 II. It's the 136 PS fixed-geometry turbo variant of the DW10 engine family, distinct from the higher-powered RHA with its variable geometry turbo.
Yes, it has good tuning potential. A simple ECU remap can safely yield 20-30 kW gains by increasing boost and adjusting fuelling. More extensive modifications are limited by the fixed-geometry turbo, but a hybrid turbo upgrade can push power further. The bottom end is robust, making it a solid base for tuning.
Real-world fuel economy is excellent. Expect around 5.5-6.5 L/100km (43-51 mpg UK) in mixed driving for a 308. Highway cruising can see figures closer to 4.5 L/100km (63 mpg UK). Economy suffers significantly if the DPF is clogged or the engine is misfiring.
Yes, absolutely. The RHR is an interference engine. If the timing chain were to fail (though extremely rare), the pistons would collide with the open valves, causing severe internal damage. Fortunately, the chain is designed to last the engine's lifetime with proper oil maintenance.
Peugeot mandates oil meeting the PSA B71 2290 specification, typically a 5W-40 semi-synthetic or synthetic oil. Using the correct oil is vital for protecting the timing chain and turbocharger. ACEA B4 rated oils are generally suitable equivalents for this Euro 4 engine.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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