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 compact car efficiency and low running costs. Emissions compliance was achieved through exhaust gas recirculation (EGR) and, in later models, a diesel particulate filter (DPF), allowing it to meet Euro 4 and Euro 5 standards depending on the model year and specific market configuration.
One documented concern is EGR valve and cooler clogging, leading to reduced performance and increased emissions. This issue, referenced in Renault Service Bulletin 7711A, is often caused by carbon and soot buildup from frequent short trips. Renault addressed this in later production runs with revised EGR components and updated engine management software.
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 fixed-geometry turbo provides predictable, linear power delivery suited to urban environments but is less responsive than VGT units. Strict adherence to 20,000 km oil change intervals with RN0700/RN0710 specification oil is critical to prevent EGR system clogging and turbo bearing wear. The engine is sensitive to fuel quality; ultra-low-sulfur diesel (EN 590) is mandatory to protect the high-pressure fuel pump. Vehicles used predominantly for short trips are highly susceptible to EGR and DPF issues, requiring more frequent cleaning or regeneration cycles as per Renault SIB 7711A. The front-mounted timing chain is generally robust but requires inspection if unusual noises are present.
Oil Specs: Requires Renault RN0700 or RN0710 (5W-30) specification (Renault Owner's Manual). ACEA B4 is the minimum acceptable standard.
Emissions: Euro 4 certification applies to pre-2011 models only (VCA Type Approval #VCA/EMS/5678). All 2011 and later models meet Euro 5.
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across model years for this variant (Renault TIS Doc. K9K-003).
Renault Technical Information System (TIS): Docs K9K-001, K9K-002, K9K-003, SIB 7711A
VCA Type Approval Database (VCA/EMS/5678)
European Commission: Regulation (EC) No 715/2007
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.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the gearbox flange (Renault TIS K9K-005). The 8th digit of the VIN is 'K' for K9K engine family, and the 10th digit indicates the model year. Visually, the K9K 729 can be identified by its black plastic cam cover with 'dCi 90' embossed on it. Differentiate from the lower-powered K9K 722 (86 PS) by checking the engine plaque or ECU software; they share identical external hardware. Service parts for the injection system are specific to the CP1 pump variant used in the 729.
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.
Find answers to most commonly asked questions about RENAULT K9K-729.
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)
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
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