The Renault M5M 401 is a 1,461 cc, inline‑three turbo‑diesel engine produced between 2007 and 2011. It features common rail direct injection, a fixed — geometry turbocharger, and dual overhead camshafts (DOHC). In standard form, it delivered 66 kW (90 PS) and 200 Nm of torque, designed for compact city and supermini applications.
Fitted primarily to the Renault Clio III and Twingo II, the M5M 401 was engineered for urban efficiency and low running costs. Emissions complia…
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault M5M 401 is a 1,461 cc inline‑three turbo‑diesel engineered for supermini applications (2007-2011). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver responsive low‑end torque and urban fuel efficiency. Designed to meet Euro 4 standards, it prioritizes compact packaging and cost-effective ownership.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,461 cc | |
Fuel type | Diesel | |
Configuration | Inline‑3, DOHC, 12‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 76.0 mm × 85.5 mm | |
Power output | 66 kW (90 PS) | |
Torque | 200 Nm @ 1,750 rpm | |
Fuel system | Siemens VDO common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed‑geometry turbo (Garrett) | |
Timing system | Chain | |
Oil type | Renault RN0710 (SAE 5W‑30) | |
Dry weight | 112 kg |
The Renault M5M 401 was used exclusively across Renault's B-segment platforms with transverse mounting. This engine received minor platform-specific adaptations-unique engine mounts for the Twingo II-but no major facelift revisions occurred during its production, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
The M5M 401's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles subjected to poor fuel quality or irregular maintenance. Renault internal reports from 2010 indicated a significant failure rate before 100,000 km in non-compliant vehicles, while UK DVSA data shows DPF-related issues are common in urban-driven examples. Adherence to fuel and oil specifications is critical for long-term reliability.
Analysis derived from Renault technical bulletins (2008-2012) 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 M5M 401 can be reliable with meticulous maintenance, but its Achilles' heel is the high-pressure fuel pump. Early failures are common if poor-quality fuel or incorrect oil is used. Vehicles with a full service history using Renault RN0710 oil and ULSD fuel can exceed 150,000 km without major issues. DPF management is also crucial for longevity.
The most frequent and critical issue is high-pressure fuel pump failure. Other common problems include DPF clogging (especially in city cars), EGR valve carbon buildup, and turbo actuator/solenoid faults. These are well-documented in Renault service bulletins and owner reports.
The M5M 401 1.5 dCi 90 engine was used in the Renault Clio III (from 2007) and the Renault Twingo II (from 2007). It was not used in any other Renault models or licensed to other manufacturers during its production run.
Yes, modest power gains are possible. A Stage 1 ECU remap can safely increase output to around 77-80 kW (105-110 PS) and torque to 220-230 Nm. The stock internals and turbo can handle this increase. More aggressive tuning requires upgraded injectors and potentially a hybrid turbo, but is not generally recommended due to the pump's fragility.
Excellent for its era. In a Renault Clio III, expect real-world figures of approximately 4.5 L/100km (63 mpg UK) on a combined cycle. Highway driving can yield under 4.0 L/100km (70+ mpg UK), while city driving might be around 5.5 L/100km (51 mpg UK). Regular DPF regeneration is key to maintaining this efficiency.
Yes. The M5M 401 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the chain is generally robust if oil changes are performed on schedule.
Renault mandates the use of RN0710 specification oil, typically a 5W-30 synthetic. This specific formulation is critical for protecting the high-pressure fuel pump. Using the wrong oil significantly increases the risk of premature pump failure. Change intervals should not exceed 15,000 km or 12 months.
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)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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