The Peugeot KF6 is a 2,946 cc, V6 naturally aspirated petrol engine produced between 1997 and 2001. It features an aluminium alloy block and heads with double overhead camshafts (DOHC) and four valves per cylinder. This engine, part of PSA's ES/L engine family co-developed with Renault, was designed for smooth, refined power delivery in executive vehicles.
Fitted primarily to the Peugeot 607 and Citroën C5, the KF6 was engineered for quiet, effortless cruising and strong mid-range torque. Emissions compliance for its production period was managed through sequential multi-point fuel injection and a dual catalytic converter system, meeting Euro 3 standards.
One documented concern is potential failure of the plastic coolant elbows and thermostat housing, which can lead to coolant leaks and overheating. This issue, referenced in PSA service documentation, is attributed to material degradation under prolonged thermal stress. Revised components using more heat-resistant materials were introduced during the production run.
Production years 1997–2001 meet Euro 3 standards for passenger vehicles (UTAC Type Approval).
The Peugeot KF6 is a 2,946 cc V6 naturally aspirated petrol engine engineered for executive sedans and estates (1997-2001). It combines sequential multi-point fuel injection with a DOHC 24-valve cylinder head to deliver smooth, linear power and refined operation. Designed to meet Euro 3 emissions standards, it prioritized NVH (Noise, Vibration, Harshness) refinement for luxury applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,946 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 87.0 mm × 82.6 mm | |
| Power output | 147 kW (200 PS) @ 6,000 rpm | |
| Torque | 285 Nm @ 4,000 rpm | |
| Fuel system | Sequential multi-point fuel injection (SAGEM) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven (maintenance-free design) | |
| Oil type | 10W-40 mineral or semi-synthetic | |
| Dry weight | Not available in public OEM docs |
The V6 configuration provides a smooth, refined driving experience but requires vigilance for coolant system integrity. The original plastic coolant elbows and thermostat housing are known failure points; replacing them with revised OEM metal or reinforced plastic parts is a critical preventative measure. Using the specified 10W-40 oil ensures proper lubrication for the hydraulic tappets and timing chain. The SAGEM injection system is generally robust but requires clean fuel and functioning sensors for optimal performance.
Oil Specs: Requires 10W-40 mineral or semi-synthetic specification (PSA Service Manual 9615). Modern ACEA A3/B3 10W-40 synthetic is an acceptable equivalent.
Emissions: Certified to Euro 3 standards for all production years (UTAC Type Approval).
Power Ratings: Measured under DIN 70020 standards (PSA Group PT-2000). Output is consistent across verified applications.
PSA Service Manual 9615 (ES/L Engine Family)
PSA Technical Bulletin TB 9615/01
UTAC (Union Technique de l'Automobile) Type Approval Archives
PSA Group Powertrain Specifications (PT-2000)
The Peugeot KF6 was used primarily in Peugeot's flagship executive sedan with longitudinal mounting. This engine was the top petrol unit for the first-generation 607 and was also fitted to the equivalent Citroën C5 V6 models. All adaptations are documented in OEM technical bulletins.
The engine code "KF6" is typically stamped on a flat machined surface on the front face of the left cylinder bank, near the alternator. The 8th digit of the VIN for a Peugeot 607 V6 is 'V'. Key visual identifiers include the large, wide V6 engine layout, twin cam covers, and the air intake plenum spanning both cylinder banks. Critical differentiation from the smaller 2.2L V6 (ES9): The KF6 has a larger displacement (2.9L vs 2.2L) and a visibly longer engine block.
The KF6's primary reliability risk is coolant system failure due to degraded plastic components, which can lead to rapid engine overheating. PSA internal service data and owner club records consistently highlight this as a common cause of breakdowns in higher-mileage vehicles. Neglecting this preventative maintenance or using incorrect oil can significantly increase the risk of major mechanical failure, making proactive component replacement critical.
Analysis derived from PSA technical bulletins (1997-2001) and aggregated data from Peugeot/Citroën owner club technical forums. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT KF6.
Comprehensive technical documentation and regulatory references
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PEUGEOT 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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