The Renault M9R 742 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 2006 and 2010. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form, it delivered 110 kW (150 PS), providing a blend of strong torque and refined cruising for mid — size applications.
Fitted primarily to the Renault Laguna III and Espace IV, the M9R 742 was engineered for drivers prioritizing highway refine…
Production years 2006–2008 meet Euro 4 standards; 2009–2010 models may have Euro 5 compliance depending on market .
The Renault M9R 742 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size sedans and MPVs (2006-2010). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑end torque and efficient highway cruising. Designed to meet Euro 4 (and some market‑specific Euro 5) standards, it balances performance with economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,188 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 97.0 mm | |
Power output | 110 kW (150 PS) | |
Torque | 340 Nm @ 2,000 rpm | |
Fuel system | Bosch CP3 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 (pre‑2009); Euro 5 depending on market | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain | |
Oil type | Renault RN0700 (SAE 5W‑30) | |
Dry weight | 185 kg |
The Renault M9R 742 was used exclusively across Renault's D-segment platforms with transverse mounting. This engine received minor platform-specific adaptations-primarily in engine mount geometry for the Espace IV-but remained largely consistent. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 M9R 742 can be reliable with meticulous maintenance, but it has a known weakness in its high-pressure fuel pump. Longevity heavily depends on using pristine fuel and the correct RN0700 oil. Addressing DPF and EGR issues promptly and adhering to service intervals greatly improves its chances of reaching high mileage without major failure.
The most frequent issues are high-pressure fuel pump failure, DPF clogging, EGR system clogging, and turbocharger actuator faults. Fuel pump problems are often linked to poor fuel quality, while DPF issues stem from driving patterns. These are covered in Renault service documentation.
The M9R 742 engine was used in the Renault Laguna III (2006-2010) and the Renault Espace IV (2006-2010), specifically in the dCi 150 variants. It was not used in any other Renault models or licensed to other manufacturers during its production run.
Aftermarket ECU tuning is common on the M9R-742 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.
Good for its size and power. In a Renault Laguna III dCi 150, expect real-world figures of approximately 6.5 L/100km (city) and 4.8 L/100km (highway), translating to roughly 48 mpg UK combined. Its strong torque makes it efficient for highway cruising and towing.
Yes. The M9R 742 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing significant and expensive internal engine damage. Fortunately, the chain is generally robust if serviced correctly.
Renault mandates the use of RN0700 specification oil, typically a 5W-30 synthetic. Using this specific oil is crucial for protecting the high-pressure fuel pump and ensuring the DPF functions correctly. Always change the oil at the recommended 15,000 km intervals.
Comprehensive technical documentation and regulatory references
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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.
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