The Renault K4M 791 is a 1,598 cc, inline‑four petrol engine produced between 2008 and 2018. It features a dual overhead camshaft (DOHC) layout with 16 valves and multi‑point fuel injection. In standard form, it delivered 81 kW (110 PS) and 151 Nm of torque, offering a refined balance of urban agility and relaxed highway cruising.
Fitted to models such as the Clio III, Mégane III, and Scénic III, the K4M 791 was engineered for responsive daily driving with an emphasis on fuel efficiency and low emissions. Emissions compliance was achieved through electronic throttle control and a three‑way catalytic converter, meeting Euro 4 standards for its primary production run, with later variants achieving Euro 5.
One documented refinement is the introduction of a revised cylinder head and intake manifold design compared to the earlier K4M 745, improving low-end torque and emissions. This update, referenced in Renault Technical Note MEC 0789, was implemented to meet tightening EU regulations and enhance driveability across the rev range.
Production years 2008–2010 meet Euro 4 standards; 2011–2018 models meet Euro 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Renault K4M 791 is a 1,598 cc inline‑four petrol engine engineered for compact hatchbacks and MPVs (2008-2018). It combines multi‑point fuel injection with a DOHC 16‑valve head to deliver smooth, linear power delivery and efficient cruising. Designed to meet Euro 4 and Euro 5 standards, it balances everyday performance with improved environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 79.5 mm × 80.5 mm | |
| Power output | 81 kW (110 PS) @ 5,750 rpm | |
| Torque | 151 Nm @ 3,750 rpm | |
| Fuel system | Multi‑point fuel injection (Siemens) | |
| Emissions standard | Euro 4 (2008–2010); Euro 5 (2011–2018) | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven | |
| Oil type | Renault RN0700 (SAE 5W‑40) | |
| Dry weight | 112 kg |
The DOHC design provides a linear, predictable power curve ideal for city and motorway use but requires strict adherence to 15,000 km oil change intervals using RN0700 specification to ensure longevity. The timing chain is generally robust but should be inspected for tensioner wear at 120,000 km. The Siemens fuel injection system is reliable but sensitive to poor fuel quality; use of premium unleaded is recommended for optimal performance and injector cleanliness. The catalytic converter is integrated with the exhaust manifold, making replacement a costly procedure if damaged.
Oil Specs: Requires Renault RN0700 (5W-40) specification (Renault Owner's Manual Ref. 77 11 308 544). Compatible with ACEA A3/B4.
Emissions: Euro 4 certification applies to 2008-2010 models; Euro 5 applies to 2011-2018 models (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under ISO 1585 standards. Output figures are for standard atmospheric conditions (Renault TIS Doc. MEC 0789).
Renault Technical Information System (TIS): Docs MEC 0789, MEC 1235
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585: Road vehicles — Engine test code — Net power
The Renault K4M 791 was used across Renault's B/C‑segment platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Scénic III and revised intake manifolds for the Mégane III-creating minor service part variations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox flange (Renault TIS MEC 0789). The full engine designation is 'K4M 791'. Visually, it can be identified by its black plastic cam cover with '16V' embossed on top. Critical differentiation from the similar K4M 745: The 791 features a slightly revised intake manifold and cylinder head casting for improved emissions. Service parts for the intake and exhaust systems are not always interchangeable between 745 and 791 variants.
The K4M 791's primary reliability risk is ignition coil failure, with elevated incidence in high-mileage or humid environments. Renault internal service data indicated a notable number of coil replacements under warranty, while owner reports frequently cite thermostat housing leaks as a secondary concern. Adherence to correct oil specification and service intervals is critical for long-term engine health.
Analysis derived from Renault technical bulletins (2008-2018) and owner-reported failure data (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT K4M-791.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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