The Renault H4M 748 is a 1,598 cc, inline‑four turbo‑diesel engine produced between 2012 and 2018. It features a compact, lightweight aluminium block, common rail direct injection, and a fixed — geometry turbocharger. This engine was designed for efficiency in smaller vehicles, delivering 81 kW (110 PS) and 260 Nm of torque, making it suitable for urban and mixed driving.
Fitted primarily to the Renault Clio IV, Captur, and Megane III, the H4M 748 prioritized fuel economy…
Production years 2012–2018 meet Euro 5 standards as per EU Regulation (EC) No 715/2007.
The Renault H4M 748 is a 1,598 cc inline‑four turbo‑diesel engineered for compact hatchbacks and crossovers (2012-2018). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver responsive low-end torque and excellent fuel efficiency. Designed to meet Euro 5 emissions standards, it balances city driving agility with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 76.0 mm × 88.0 mm | |
Power output | 81 kW (110 PS) | |
Torque | 260 Nm @ 1,750 rpm | |
Fuel system | Bosch CP1 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 15.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed‑geometry turbo (Garrett) | |
Timing system | Chain-driven | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 135 kg |
The Renault H4M 748 was used in Renault's compact platforms with transverse mounting. This engine received specific calibrations for each model, including different ECU mappings for the Clio and Captur. All adaptations are documented in OEM technical bulletins.
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The H4M 748's primary reliability focus is on its EGR system and DPF. Renault service data indicates the EGR valve and cooler are the most frequent sources of repair. Vehicles used predominantly for short urban trips are at higher risk for DPF-related issues, while those using poor-quality fuel may experience injector or EGR problems.
Analysis derived from Renault technical bulletins (2012-2018) and EU regulatory compliance data. 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 H4M 748 is generally reliable for its intended use in compact vehicles when maintained correctly. Its main long-term risks are the EGR system and DPF. Adhering strictly to service schedules, using the correct oil and high-quality diesel, and ensuring the DPF regenerates properly are key to achieving high mileage without major issues.
The most frequent issues are clogging of the EGR valve and cooler, saturation of the Diesel Particulate Filter (DPF), faults with fuel injectors, and failures of the turbocharger actuator. These are well-documented in Renault service information.
The H4M 748 engine was used in the fourth-generation Renault Clio (2012-2018), the first-generation Renault Captur (2013-2018), and the third-generation Renault Megane (Phase 3, 2012-2015), all badged as the dCi 110.
Aftermarket ECU tuning is common on the H4M-748 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is excellent for a diesel, especially in the Clio. Expect figures between 4.0 - 5.5 L/100km (53 - 71 mpg UK) for combined driving. Highway cruising can yield even better results, while constant urban stop-start driving will be less efficient.
Yes. Like virtually all modern engines, the H4M 748 is an interference design. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. The timing chain is designed to last the life of the engine with proper maintenance.
Renault mandates the use of RN0720 specification oil, typically a 5W-30 synthetic low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil. This is crucial for protecting the emissions aftertreatment systems (DPF, EGR). Using the wrong oil can lead to rapid DPF clogging and system failure.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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