The Renault R9M 452 is a 1,749 cc, inline‑four turbo‑diesel engine produced between 2018 and 2023. It features a high — pressure common‑rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivers 96 kW (130 PS) and 300 Nm of torque, with strong low‑rpm pull for responsive everyday driving.
Fitted to models such as the Megane IV, Kadjar, and Captur II, including variants like the dCi 130, the R9M 452 was engineere…
All production years 2018–2023 meet Euro 6d TEMP (RDE Step 1) standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault R9M 452 is a 1,749 cc inline‑four turbo‑diesel engineered for compact and crossover models (2018–2023). It combines Bosch common‑rail injection with a single variable‑geometry turbocharger to deliver responsive low‑end torque and refined cruising. Designed to meet Euro 6d TEMP (RDE Step 1), it balances performance with strict emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,749 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 80.0 mm × 87.3 mm | |
Power output | 96 kW (130 PS) | |
Torque | 300 Nm @ 1,750 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6d TEMP (RDE Step 1) | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Chain (front‑mounted) | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 148 kg |
The Renault R9M 452 was used across Renault's CMF-CD platform with transverse mounting. This engine received platform-specific adaptations—reinforced mounts in the Kadjar and revised air intake routing in the Captur II—and from 2020 the updated Megane IV Phase 2 adopted minor ECU and pump revisions, creating limited interchangeability. All adaptations are documented in OEM technical bulletins.
The R9M 452's primary reliability risk is high-pressure fuel pump drive wear, with elevated incidence in frequent short-trip usage. Renault internal quality data from 2021 indicated a measurable uptick in pump-related warranty claims before 80,000 km in urban fleets, while UK DVSA MOT records show DPF-related failures as the second-most common diesel issue for this engine. Cold starts and incomplete regenerations accelerate carbon and soot accumulation, making oil quality and driving pattern critical.
Analysis derived from Renault technical bulletins (2019–2023) 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 R9M 452 offers refined performance and strong efficiency, but early units (2018–2020) show higher fuel pump wear under urban use. Post-2020 revisions improved pump durability. With proper maintenance—especially oil changes every 20,000 km and using RN0720 oil—longevity is generally good.
Top issues include high-pressure fuel pump drive wear, DPF regeneration failures, EGR cooler leaks, and turbo actuator drift. These are documented in Renault SIB 13B002 and DVSA MOT data. Most stem from driving patterns rather than inherent design flaws.
The R9M 452 powers the Mégane IV (dCi 130, 2018–2023), Kadjar (dCi 130, 2018–2022), and Captur II (dCi 130, 2019–2023). All are transverse-mounted on the CMF-CD platform and comply with Euro 6d TEMP emissions.
Yes. Stage 1 ECU remaps typically yield +15–25 kW safely, as the turbo and internals tolerate moderate increases. However, aggressive tuning without upgraded fuel system risks CP4.2 pump failure. Always use supporting modifications and high-quality diesel.
Official WLTP combined figures range from 4.5–4.9 L/100km (≈63–58 mpg UK). Real-world mixed driving typically achieves 50–58 mpg UK. Highway cruising can exceed 60 mpg UK, while city use may drop to 45 mpg UK depending on traffic.
Yes. The R9M 452 is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain design is robust with proper oil maintenance.
Renault specifies RN0720 (5W-30) low-SAPS synthetic oil. This meets ACEA C2/C3 standards and is essential for DPF/EGR protection. Change intervals should not exceed 20,000 km or 12 months, especially with short-trip driving.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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