The Renault K9K 729 is a 1,461 cc, inline‑three turbo‑diesel engine produced between 2007 and 2018. It features a cast iron block, aluminium cylinder head, common rail direct injection, and a fixed geometry turbocharger. In its most common form, it delivers 66 kW (90 PS) and 200 Nm of torque, offering a balance of fuel economy and adequate performance for city and highway driving.
Fitted to models such as the Clio III, Mégane III, and Scénic III, the K9K 729 was engineered for c…
Production years 2007–2010 meet Euro 4 standards; 2011–2018 models meet Euro 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Renault K9K 729 is a 1,461 cc inline‑three turbo‑diesel engineered for compact hatchbacks and MPVs (2007-2018). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver adequate low‑end torque and efficient urban running. Designed to meet Euro 4 and Euro 5 standards, it prioritises fuel economy and low running costs.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,461 cc | |
Fuel type | Diesel | |
Configuration | Inline‑3, SOHC, 12‑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 | Bosch CP1 common‑rail (up to 1,350 bar) | |
Emissions standard | Euro 4 (pre‑2011); Euro 5 (2011 onwards) | |
Compression ratio | 16.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | Renault RN0700 or RN0710 (SAE 5W‑30) | |
Dry weight | 110 kg |
The Renault K9K 729 was used across Renault's B/C platform vehicles with transverse mounting. This engine received platform-specific adaptations-different engine mounts for the Scénic versus the Clio-but no major facelift revisions that affect core compatibility within its production run. All adaptations are documented in OEM technical bulletins.
The K9K 729's primary reliability risk is EGR system failure, with elevated incidence in vehicles subjected to frequent short trips. Renault internal service data indicates a high frequency of EGR-related repairs on urban-driven vehicles, while UK DVSA MOT statistics show EGR faults as a leading cause of diesel particulate filter (DPF) warning lights. Inadequate warm-up cycles make proactive cleaning and high-quality fuel critical.
Analysis derived from Renault technical bulletins (2008-2016) 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 729 is generally robust for long-term use if maintained correctly. Its main weakness is the EGR system, which fails frequently in city-driven cars. Regular oil changes, using quality fuel, and occasional longer drives to clear the DPF are crucial for longevity. With proper care, these engines can easily exceed 200,000 km.
The most frequent issues are EGR valve/cooler clogging, turbo actuator failure, and glow plug/module faults. Oil leaks from the rocker cover gasket are also common on higher-mileage examples. These are well-documented in Renault service bulletins and owner reports.
The 1.5 dCi 90 PS engine was fitted to the Renault Clio III (2007-2012), Mégane III (2008-2015), Scénic III (2009-2015), and the Dacia Duster (2010-2017). It was a mainstay in Renault's compact and small SUV lineup for nearly a decade.
Yes, the K9K 729 responds well to ECU remapping. A Stage 1 remap can safely increase power to around 110-115 PS and torque to 240-250 Nm. The standard internals are strong enough for this level of tune. More aggressive tuning requires supporting modifications like a hybrid turbo.
Excellent. In a Renault Clio III, expect real-world figures of 4.5-5.0 L/100km (56-50 mpg UK) on a mixed cycle. Highway driving can yield under 4.0 L/100km (70+ mpg UK). Its efficiency is one of its strongest selling points.
Yes. The K9K 729 is an interference engine. If the timing chain were to fail (which is rare but possible), the pistons would collide with the open valves, causing catastrophic internal damage. This underscores the importance of addressing any unusual engine noises promptly.
Renault specifies either RN0700 or RN0710 5W-30 synthetic oil. Using the correct specification is vital for protecting the turbocharger, maintaining EGR/DPF function, and ensuring proper lubrication of the timing chain. Change intervals should not exceed 20,000 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
WLTP and RDE testing procedures for emissions certification.
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