The Renault M9R 805 is a 2,148 cc, inline‑four turbo‑diesel engine produced between 2010 and 2018. It features a double overhead camshaft (DOHC) layout, common rail direct injection, and a variable geometry turbocharger (VGT). This engine was designed to offer a blend of strong low — end torque for effortless towing and refined highway cruising, with outputs ranging from 130 kW (177 PS) to 150 kW (204 PS) and peak torque of 380–400 Nm.
Fitted primarily to the Laguna III, Espa…
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models may have Euro 6 compliance depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Renault M9R 805 is a 2,148 cc inline‑four turbo‑diesel engineered for executive and MPV models (2010-2018). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong, linear torque and refined performance. Designed to meet Euro 5 (and some market‑specific Euro 6) standards, it balances power with long-distance efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,148 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 88.0 mm × 88.3 mm | |
Power output | 130–150 kW (177–204 PS) | |
Torque | 380–400 Nm @ 1,750–2,750 rpm | |
Fuel system | Bosch CP4 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 5 (pre‑2015); Euro 6 depending on market | |
Compression ratio | 15.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Chain | |
Oil type | Renault RN0710 (SAE 5W‑30) | |
Dry weight | 185 kg |
The Renault M9R 805 was used across Renault's Laguna/Espace platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts in the Espace for MPV duty-and from 2015 received emissions hardware updates for Euro 6 compliance in select markets, creating minor parts variations. All adaptations are documented in OEM technical bulletins.
The M9R 805's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel or exceeding service intervals. Renault internal reports indicated a notable failure rate before 150,000 km for neglected units, while UK DVSA records show DPF-related issues are common in vehicles used predominantly for short urban journeys. Fuel quality and strict adherence to maintenance schedules are critical for long-term reliability.
Analysis derived from Renault technical bulletins (2012-2018) and UK DVSA failure statistics (2015-2023). 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 M9R 805 is a powerful and refined engine, but its long-term reliability hinges on meticulous maintenance, particularly regarding fuel and oil quality. The high-pressure fuel pump is its Achilles' heel. Vehicles serviced regularly with the correct Renault RN0710 oil and high-quality diesel can be very dependable. Neglect, especially extended service intervals, significantly increases the risk of major failure.
The most frequent issues are high-pressure fuel pump failures, DPF blockages (especially in urban use), EGR valve/carbon buildup, and turbo actuator faults. These are well-documented in Renault service bulletins. Oil leaks from the rocker cover gasket are also a common, less severe complaint on higher-mileage examples.
The M9R 805 was primarily used in the Renault Laguna III (2010-2015), Espace IV (2010-2015), and Latitude (2010-2015) models, badged as dCi 175 or dCi 200. A lower-powered Euro 6 variant (dCi 175) continued in the Laguna until 2018. It was not licensed to other manufacturers like Nissan for this specific code.
Yes, the M9R 805 responds well to ECU remapping. Stage 1 tunes can safely increase power to around 190-220 kW (250-300 PS) and torque to 450-500 Nm. The stock internals are robust. However, tuning increases stress on the clutch, turbo, and fuel system, so supporting modifications and even more rigorous maintenance are strongly advised to ensure reliability.
Official combined figures range from 5.5 to 6.0 L/100km (approx. 47-51 mpg UK), depending on the model and year. Real-world consumption is typically higher, around 6.5-8.0 L/100km (35-43 mpg UK) for mixed driving. Highway cruising can yield excellent figures of 5.0-5.5 L/100km (51-56 mpg UK), while urban driving with DPF regeneration can push it over 8.0 L/100km.
Yes. The M9R 805 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. While the chain is generally robust, any unusual noises from the timing area should be investigated immediately to prevent this scenario.
Renault mandates the use of fully synthetic oil meeting the RN0710 specification, typically SAE 5W-30 viscosity. This specific oil is crucial for protecting the high-pressure fuel pump and turbocharger. Using the correct oil and adhering to the 20,000 km (or annual) service interval is non-negotiable for engine longevity.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
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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
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