The Renault R9M 408 is a 1,749 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 96 kW (130 PS), with peak torque of 300 Nm delivered between 1,750 and 2,500 rpm, providing responsive low‑rpm pulling power ideal for urban and mixed driving.
Fitted to models including the Clio V, Captur II, and Arkana—alongside Nissan equivalents such as the Juke II and Kicks—the R9M 408 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), and selective catalytic reduction (SCR) with AdBlue injection.
One documented concern is premature wear of the high-pressure fuel pump (Bosch CP4.2), referenced in Renault Service Bulletin RNT/2020/04. This issue is linked to marginal diesel lubricity and extended oil change intervals, leading to internal scuffing. From 2021, 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/8890).
The Renault R9M 408 is a 1,749 cc inline‑four turbo‑diesel engineered for compact passenger vehicles (2018–2024). It combines Bosch CP4.2 common‑rail injection with a single variable‑geometry turbocharger to deliver responsive low‑rpm torque and efficient urban driving. 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 | 1,749 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 78.0 mm × 91.4 mm | |
| Power output | 96 kW (130 PS) | |
| Torque | 300 Nm @ 1,750–2,500 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 | 145 kg |
The R9M 408 delivers responsive torque ideal for city and 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 2021, updated CP4.2 seals and enhanced fuel pre-filtration improved reliability per Renault SIB RNT/2020/04.
Oil Specs: Requires Renault RN0720 (5W-30) low-SAPS oil (Renault SIB RNT/2020/04). Equivalent to ACEA C4.
Emissions: Euro 6d-Temp applies to 2018–2020 models; Euro 6d to 2021–2024 (VCA Type Approval #VCA/EMS/8890).
Power Ratings: Measured under UN ECE R85. Requires EN 590 diesel and functional AdBlue system (Renault TIS Doc. R31125).
Renault Technical Information System (TIS): Docs R31020, R31021, SIB RNT/2020/04
VCA Type Approval Database (VCA/EMS/8890)
UNECE Regulation No. 85 (Engine Power Measurement)
The Renault R9M 408 was used across Renault's Clio V, Captur II, and Arkana platforms with transverse mounting and co-developed with Nissan for shared applications. This engine received platform-specific adaptations—revised engine mounts in the Arkana and compact exhaust manifolds in the Clio—and all variants integrate AdBlue SCR from launch, creating strict interchange limits with pre-Euro 6d engines. Partnerships enabled Nissan to use the same block in the Juke II and Kicks. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Renault TIS R31025). The 7th VIN digit indicates engine family ('M' for R9M series). All R9M 408 units feature black valve covers and an AdBlue tank (typically 12–15 L capacity). Critical differentiation from earlier R9M variants: R9M 408 includes RDE-compliant SCR catalyst and updated NOx sensors for Euro 6d certification. Service parts are not interchangeable with pre-Euro 6d R9M engines due to emissions hardware and ECU mapping differences (Renault SIB RNT/2020/04).
The R9M 408'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 (2022) indicated up to 12% of 2018–2020 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 R9M-408.
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