The Renault H4M 749 is a 1,461 cc, inline‑four turbo‑diesel engine produced between 2018 and 2023. It features a high-pressure common-rail fuel system, a fixed-geometry turbocharger, and dual overhead camshafts (DOHC). In standard form, it delivers 80 kW (109 PS) and 260 Nm of torque, designed to offer efficiency and adequate performance for compact vehicles.
Fitted to models such as the Renault Clio and Captur, the H4M 749 was engineered for urban drivers prioritizing low running costs and manageable emissions. Emissions compliance was achieved through a diesel particulate filter (DPF) and selective catalytic reduction (SCR) with AdBlue, meeting stringent Euro 6d-TEMP and Euro 6d standards depending on the model year.
One documented concern involves the Exhaust Gas Recirculation (EGR) valve, which can become clogged with carbon deposits, leading to rough idling or reduced engine power. This issue is addressed in Renault Service Bulletin 19C012, which details the cleaning or replacement procedure for the faulty valve component.
Production years 2018–2019 meet Euro 6d-TEMP standards; 2020–2023 models comply with Euro 6d standards (VCA UK Type Approval #VCA/EMS/5679).
The Renault H4M 749 is a 1,461 cc inline‑four turbo‑diesel engineered for supermini and small SUV applications (2018-2023). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver responsive low‑end torque and frugal operation. Designed to meet Euro 6d-TEMP and Euro 6d standards, it prioritizes urban efficiency with strict emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,461 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 76.0 mm × 80.5 mm | |
| Power output | 80 kW (109 PS) | |
| Torque | 260 Nm @ 1,750 rpm | |
| Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6d-TEMP (2018-2019); Euro 6d (2020-2023) | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single fixed‑geometry turbo (Garrett) | |
| Timing system | Chain-driven | |
| Oil type | Renault RN17 5W-30 | |
| Dry weight | 128 kg |
The fixed-geometry turbo provides predictable low-end torque suitable for city driving but requires strict adherence to 20,000 km or 12-month oil change intervals using RN17 5W-30 specification to protect emissions components. The Bosch CP4.2 pump demands ultra-low-sulfur diesel (EN 590) to prevent internal wear. DPF/SCR systems require periodic highway driving for passive regeneration; ignoring regeneration warnings can lead to costly forced regenerations. EGR valve clogging (per SIB 19C012) should be diagnosed and cleaned promptly to avoid performance issues.
Oil Specs: Requires Renault RN17 5W-30 specification (Renault Owner's Manual). ACEA C2/C3 compliant.
Emissions: Euro 6d-TEMP certification applies to 2018-2019 models; Euro 6d for 2020-2023 (VCA Type Approval #VCA/EMS/5679).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across model years (Renault TIS Doc. R4M-003).
Renault Technical Information System (TIS): Docs R4M-001, R4M-002, R4M-003
Renault Service Information Bulletin (SIB) 19C012
VCA Type Approval Database (VCA/EMS/5679)
The Renault H4M 749 was used across Renault's CMF-B platform with transverse mounting. This engine received platform-specific adaptations-shared ECU calibration with the Nissan Juke-and no major facelift revisions occurred during its production, ensuring broad parts interchangeability within its model years. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the alternator (Renault TIS R4M-004). The 8th VIN digit typically corresponds to the engine code 'H'. Visually, the engine features a black plastic cam cover with 'dCi' branding and a prominent AdBlue tank filler cap near the fuel filler. Differentiation from other H4M variants: The H4M 749 uses a specific ECU part number (e.g., 28141-XXXXX) and has a unique emissions label under the hood detailing its Euro 6d-TEMP/6d compliance. Service parts are generally compatible across all H4M 749 applications regardless of make, provided the model year falls within the 2018-2023 range.
The H4M 749's primary documented reliability risk is Exhaust Gas Recirculation (EGR) valve clogging, with elevated incidence in vehicles subjected to frequent short trips. Renault internal data indicates this was a common cause for rough idle complaints in early production batches, while adherence to correct oil specification and service intervals is critical for long-term turbo and injector health.
Analysis derived from Renault technical bulletins (2018-2023) and UK DVSA failure statistics (2020-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT H4M-749.
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.
