The Renault K9K 712 is a 1,461 cc, inline‑four turbo‑diesel engine produced between 2007 and 2012. It features a single overhead camshaft (SOHC) design with 8 valves and common rail direct injection, delivering outputs typically around 66 kW (90 PS) and 200 Nm of torque. Its compact, lightweight architecture prioritises fuel efficiency and urban drivability with enhanced power over earlier variants.
Fitted to models such as the Clio III, Mégane III, and Twingo II, the K9…
Production years 2007–2010 meet Euro 4 standards; 2011–2012 models may have Euro 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/5682).
The Renault K9K 712 is a 1,461 cc inline‑four turbo‑diesel engine engineered for compact hatchbacks and city cars (2007-2012). It combines common rail direct injection with a SOHC 8‑valve head to deliver strong low-RPM torque and efficient urban drivability. Designed to meet Euro 4 (and some market‑specific Euro 5) standards, it balances frugality with practical performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,461 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 76.0 mm × 80.5 mm | |
Power output | 66 kW (90 PS) | |
Torque | 200 Nm @ 1,750 rpm | |
Fuel system | Common rail direct injection (Delphi) | |
Emissions standard | Euro 4 (pre‑2011); Euro 5 depending on market | |
Compression ratio | 18.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed geometry turbo (Garrett) | |
Timing system | Belt‑driven (requires periodic replacement) | |
Oil type | Renault RN0700 (SAE 5W‑40) | |
Dry weight | 110 kg |
The Renault K9K 712 was used across Renault's B/C platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Twingo and revised exhaust manifolds in facelifted Mégane models-and from 2012 the Clio IV adopted a different engine family, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The K9K 712's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles subjected to poor fuel quality. Renault internal data indicated a notable number of cases before 100,000 km, while owner reports frequently cite timing belt failure as a major concern if neglected. Infrequent oil changes and use of low-quality diesel make adherence to the RN0700 specification and fuel quality critical.
Analysis derived from Renault technical bulletins (2007-2012) 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 K9K 712 is generally reliable with a simple design, but long-term durability depends on strict maintenance. The critical items are timely timing belt changes (every 100,000 km/5 years), using the correct RN0700 (5W-40) oil, and using high-quality diesel to protect the fuel pump. With proper care, these engines can easily exceed 250,000 km.
The most frequent issues are high-pressure fuel pump failure (causing loss of power), timing belt failure if neglected, EGR valve failure due to carbon buildup, and turbocharger failure from oil starvation. These are well-documented in Renault service bulletins and owner reports.
This 1.5L dCi diesel engine was primarily used in the Renault Clio III (2007-2012), Mégane III (2008-2012), and Twingo II (2007-2012), typically badged as '1.5 dCi 90'. It was also used in some Dacia and Nissan models of that era.
Yes, modest gains are possible. ECU remaps can yield around +15-20 kW by optimizing fuel and boost pressure. Significant power increases require upgraded injectors and turbo, which is costly. Most tuning focuses on improving low-end torque for better drivability.
Fuel economy is excellent. Expect around 4.5-5.0 L/100km (56-63 mpg UK) in mixed driving for a Clio or Twingo. The slightly heavier Mégane may achieve 5.0-5.5 L/100km (51-56 mpg UK). Consumption is lowest on steady highway runs.
Yes. The K9K 712 is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing severe internal damage that requires a costly engine rebuild or replacement.
Renault mandates RN0700 specification oil, typically SAE 5W-40. Using this specific oil is crucial for protecting the turbocharger and fuel system. Always use a high-quality, fully synthetic oil that meets this standard and change it every 20,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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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.
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