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.
Fitted to models including the Talisman, Mégane IV, Scénic IV, Espace V, and Koleos II—alongside Nissan equivalents such as the Qashqai II, X-Trail II, and Navara—the M9R 866 was engineered to meet Euro 6d-Temp and Euro 6d emissions standards from launch. Compliance is achieved through cooled exhaust gas recirculation (EGR), a diesel particulate filter (DPF), selective catalytic reduction (SCR) with AdBlue injection, and an on-board diagnostics system compliant with OBD‑2 Phase II.
One documented concern is premature wear of the high-pressure fuel pump (Bosch CP4.2), referenced in Renault Service Bulletin RNT/2019/07. This issue is linked to marginal diesel lubricity and extended oil change intervals, leading to internal scuffing. From 2020, updated pump seals and revised fuel pre-filtration were introduced to enhance durability.
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 M9R 866 delivers smooth, high-torque performance ideal for mixed driving but requires strict adherence to 20,000 km or 12-month oil change intervals using Renault RN0720 (5W-30) low-SAPS oil to protect the Bosch CP4.2 high-pressure fuel pump and turbocharger. Use of EN 590-compliant ultra-low-sulfur diesel is mandatory; poor fuel quality causes pump seizure. The AdBlue system must be refilled regularly—neglect triggers power reduction or no-start conditions. From 2020, updated CP4.2 seals and enhanced fuel pre-filtration improved reliability per Renault SIB RNT/2019/07.
Oil Specs: Requires Renault RN0720 (5W-30) low-SAPS oil (Renault SIB RNT/2019/07). Equivalent to ACEA C4.
Emissions: Euro 6d-Temp applies to 2018–2020 models; Euro 6d to 2021–2024 (VCA Type Approval #VCA/EMS/9012).
Power Ratings: Measured under UN ECE R85. Requires EN 590 diesel and functional AdBlue system (Renault TIS Doc. R26015).
Renault Technical Information System (TIS): Docs R24680, R25142, SIB RNT/2019/07
VCA Type Approval Database (VCA/EMS/9012)
UNECE Regulation No. 85 (Engine Power Measurement)
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.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Renault TIS R24890). The 7th VIN digit indicates engine family ('8' for M9R series). All M9R 866 units feature black valve covers and an AdBlue tank (typically 17–20 L capacity). Critical differentiation from earlier M9R engines: M9R 866 includes RDE-compliant SCR catalyst and updated NOx sensors for Euro 6d certification. Service parts are not interchangeable with pre-Euro 6d M9R variants due to emissions hardware and ECU mapping differences (Renault SIB RNT/2019/07).
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.
Find answers to most commonly asked questions about RENAULT M9R-866.
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