The Renault 843 721 is a 1,461 cc, inline‑three turbo‑diesel engine produced between 2006 and 2010. It features an all — aluminium block and head, a timing chain, and a high — pressure common — rail fuel system with piezoelectric injectors. This compact powerplant was engineered for efficiency and low emissions, delivering 66 kW (90 PS) and 200 Nm of torque, making it ideal for urban and subcompact vehicles.
Fitted primarily to the Clio III and Twingo II, the 843 721 prioritis…
Production years 2006–2010 meet Euro 4 standards .
The Renault 843 721 is a 1,461 cc inline‑three turbo‑diesel engineered for subcompact hatchbacks (2006-2010). It combines a high-pressure common-rail injection system with a variable-geometry turbocharger to deliver responsive low-end torque and excellent fuel economy. Designed to meet Euro 4 standards, it represents Renault's push for diesel efficiency in its smallest platforms.
| 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 | 16.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Variable-geometry turbo (Honeywell) | |
Timing system | Chain-driven | |
Oil type | Renault RN0700 (SAE 5W‑30) | |
Dry weight | Not Available |
The Renault 843 721 was used across Renault's Clio III and Twingo II platforms with transverse mounting. This engine received minimal platform-specific adaptations and was not licensed to other manufacturers. All applications 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 843 721 is generally reliable if its known weak points are addressed. The EGR cooler is the most critical failure item, often failing around 100,000 km. With the cooler replaced and regular maintenance (especially oil changes and DPF regeneration), these engines can easily reach 150,000-200,000 km without major issues.
The most frequent issues are EGR cooler failure leading to coolant loss, DPF clogging from short trips, turbocharger actuator faults causing loss of boost, and glow plug failures affecting cold starts. These are well-documented in Renault service bulletins and owner reports.
This 1.5 dCi engine was used in the first phase of the Clio III (2006-2010) and the Twingo II (2007-2010). It was consistently badged as the 1.5 dCi 90 across both models, indicating its 90 PS power output.
Aftermarket ECU tuning is common on the 843-721 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.
Excellent. In a Clio III, expect real-world figures of 4.5-5.5 L/100km (51-62 mpg UK) on a mixed run. Highway cruising can yield under 4.0 L/100km (70+ mpg UK). Its small displacement and diesel efficiency make it one of the most economical engines of its era.
Yes, it is an interference engine. If the timing chain were to fail (which is rare but possible), the pistons would collide with the valves, causing significant internal damage. Fortunately, the chain is very durable and typically lasts the life of the engine with proper oil maintenance.
Renault specifies an oil meeting the RN0700 standard, typically a 5W-30 synthetic. Using the correct specification is vital for protecting the high-pressure components of the common-rail injection system and ensuring the timing chain tensioner operates correctly.
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.
GOV.UK: Vehicle Approval
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