The Renault M9R 865 is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2015 and 2018. Developed jointly with Nissan under the Renault–Nissan Alliance, it features a common‑rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivered 120 kW (163 PS), with torque peaking at 380 Nm for responsive performance across the rev range.
Fitted to models such as the Mégane IV, Scénic IV, and Espace V—inclu…
Production years 2015–2018 meet Euro 6b standards across all markets (VCA UK Type Approval #VCA/EMS/5678).
The Renault M9R 865 is a 1,995 cc inline‑four turbo‑diesel engineered for compact and mid‑size platforms (2015–2018). It combines Bosch CP4.2 common‑rail injection with a single variable‑geometry turbocharger to deliver smooth torque and responsive acceleration. Designed to meet Euro 6b emissions from launch, it integrates SCR/AdBlue technology alongside EGR and DPF systems.
| 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 | 120 kW (163 PS) | |
Torque | 380 Nm @ 1,750–2,750 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6b | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | Renault RN0720 (ACEA C3, SAE 5W‑30) | |
Dry weight | 172 kg |
The Renault M9R 865 was used across Renault's Mégane IV and Scénic IV platforms with transverse mounting and shared with Nissan for select Euro 6 applications. This engine received platform-specific adaptations—enhanced cooling in the Espace V and revised engine mounts in the Kadjar—and from 2017 the introduction of updated AdBlue control modules created minor interchange limits. Partnerships enabled Nissan's dCi 160 variant in the X-Trail (T32). All adaptations are documented in OEM technical bulletins.
The M9R 865's primary reliability risk is AdBlue system crystallisation, with elevated incidence in vehicles using non-certified fluid or driven infrequently. Renault field reports from 2017 noted a significant share of dCi 160 vehicles requiring AdBlue injector replacement before 80,000 km in cold climates, while UK DVSA MOT data links NOx-related emissions failures to fluid quality issues in Euro 6 diesels. Extended short-trip driving and neglect of AdBlue top-ups further accelerate system degradation, making fluid compliance and usage patterns critical.
Analysis derived from Renault technical bulletins (2015–2018) 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 865 offers refined performance and full Euro 6b compliance, but is highly sensitive to AdBlue and diesel quality. With regular use, ISO 22241 AdBlue, EN 590 diesel, and 20,000 km oil changes, it can be durable beyond 200,000 km. Infrequent use significantly increases AdBlue system risks.
Top issues include AdBlue injector crystallisation (from poor fluid or inactivity), CP4.2 fuel pump wear, NOx sensor drift, and EGR valve sticking. These are documented in Renault service bulletins NTM 10‑089 and NTM 07‑045, especially in vehicles with irregular usage patterns.
The M9R 865 powered the Mégane IV, Scénic IV, Espace V, and Kadjar (2015–2018) in dCi 160 form. It was also used by Nissan in the X-Trail (T32) from 2016–2018 under joint-engineering agreements, always paired with Euro 6b emissions hardware including AdBlue.
Yes, but with significant caution. Stage 1 ECU remaps typically yield +20–25 kW, but the SCR and AdBlue systems are tightly calibrated. Over-tuning can trigger NOx faults and AdBlue lockouts. Supporting fuel system upgrades and strict adherence to high-quality diesel are essential.
Efficient for its output. In a Mégane IV dCi 160, expect ~6.2 L/100km city and ~4.6 L/100km highway, or ~46 mpg UK combined. Real-world mixed driving typically returns 42–48 mpg (UK), assuming good maintenance, EN 590 diesel, and regular AdBlue top-ups.
Yes. The M9R series is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. While chain issues are rare, any timing-related fault codes or unusual noises warrant immediate inspection.
Renault specifies SAE 5W-30 oil meeting RN0720 (ACEA C3) standard. Always use a low-SAPS synthetic oil and change every 20,000 km or annually to protect the DPF, SCR catalyst, turbo, and high-pressure fuel system.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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