The Renault M9R 866 is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2018 and 2024. Developed under the Renault–Nissan–Mitsubishi Alliance, it features a high — pressure common‑rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). Power output is rated at 130 kW (177 PS), with peak torque of 380 Nm delivered between 2,000 and 2,500 rpm, providing strong low‑rpm pulling power ideal for urban and motorway driving.
F…
All production years (2018–2024) meet Euro 6d-Temp (2018–2020) and Euro 6d (2021–2024) standards (VCA UK Type Approval #VCA/EMS/9012).
The Renault M9R 866 is a 1,995 cc inline‑four turbo‑diesel engineered for mid‑size and large passenger vehicles (2018–2024). It combines Bosch CP4.2 common‑rail injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and refined highway cruising. Designed to meet Euro 6d-Temp and Euro 6d emissions standards from launch, it integrates AdBlue SCR, EGR, and DPF systems to balance performance with stringent regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 130 kW (177 PS) | |
Torque | 380 Nm @ 2,000–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) with AdBlue SCR | |
Emissions standard | Euro 6d-Temp (2018–2020); Euro 6d (2021–2024) | |
Compression ratio | 15.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett or BorgWarner) | |
Timing system | Chain (front‑mounted; durable design) | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 168 kg |
The Renault M9R 866 was used across Renault's Talisman, Mégane IV, Scénic IV, Espace V, and Koleos II platforms with transverse mounting and co-developed with Nissan for shared applications. This engine received platform-specific adaptations—reinforced engine mounts in the Espace V and revised exhaust manifolds in the Talisman—and all variants integrate AdBlue SCR from launch, creating strict interchange limits with pre-Euro 6d M9R engines. Partnerships enabled Nissan to use the same block in the Qashqai II, X-Trail II, and Navara. All adaptations are documented in OEM technical bulletins.
The M9R 866's primary reliability risk is high-pressure fuel pump (Bosch CP4.2) failure, with elevated incidence in vehicles using non-EN 590 diesel or with extended oil change intervals. Renault internal service data (2021) indicated up to 15% of 2018–2019 engines required pump replacement before 100,000 km, while UK DVSA MOT records show AdBlue system faults as a growing cause of emissions-related failures. Infrequent use and poor fuel quality accelerate wear, making adherence to service intervals and fuel standards critical.
Analysis derived from Renault technical bulletins (2018–2024) and UK DVSA failure statistics (2020–2023). 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 866 offers strong performance and full Euro 6d compliance, but early models (2018–2019) are prone to high-pressure fuel pump failures if poor-quality diesel is used. Later revisions (2020+) improved pump durability. Regular oil changes using RN0720 5W-30, strict adherence to EN 590 diesel, and timely AdBlue refills greatly extend engine life.
Top issues include Bosch CP4.2 fuel pump failure, AdBlue system faults (dosing valve clogging, NOx sensor errors), EGR cooler clogging, and turbo actuator sticking. These are well-documented in Renault service bulletin RNT/2019/07, especially in high-mileage or poorly maintained vehicles.
The M9R 866 powered the Talisman, Mégane IV, Scénic IV, Espace V, and Koleos II from 2018–2024. It was also used by Nissan in the Qashqai II, X-Trail II, and Navara under joint development. All variants produce 177 PS and include AdBlue SCR for Euro 6d compliance.
Yes. Stage 1 ECU remaps typically yield +20–30 kW safely on stock hardware, as the M9R internals are robust. Higher stages require upgraded turbo, intercooler, and fuel system. Tuning must retain AdBlue functionality to pass RDE emissions checks; disabling SCR may trigger faults or legal non-compliance.
In a Mégane IV 2.0 dCi 177, expect ~5.9 L/100km (city) and ~4.6 L/100km (highway), or ~48 mpg UK combined. Real-world mixed driving typically returns 44–51 mpg (UK), depending on model, driving style, and AdBlue system health.
Yes. The M9R series is an interference engine. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain is generally durable with proper oil maintenance.
Renault specifies 5W-30 synthetic oil meeting RN0720 (low-SAPS) standard. This protects the DPF, SCR catalyst, and turbo. Change every 20,000 km or 12 months—whichever comes first—to prevent sludge and fuel pump wear.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with RENAULT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
RENAULT 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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialRENAULT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.