The Peugeot 6FZ (EW7J4) is a 1,749 cc, inline‑four naturally aspirated petrol engine produced between 2001 and 2008. It features a SOHC 16‑valve design with multipoint fuel injection, delivering a balance of economy and accessible performance. In standard applications, it produces 77 kW (105 PS), engineered for dependable daily driving in compact and mid-size vehicles.
Fitted to models like the Peugeot 307, 406, and Citroën C5, the 6FZ was designed for smooth, linear power delivery and low running costs. Emissions compliance for its production period was achieved through a three-way catalytic converter and precise engine management, meeting Euro 3 standards.
One documented reliability concern involves premature failure of the plastic inlet manifold, potentially leading to coolant leaks or vacuum leaks. This issue, referenced in Peugeot Service Bulletin 05BZ22, is often linked to thermal stress and material fatigue. Later revisions saw the manifold replaced with a more durable composite material.
Production years 2001–2008 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/4567).
The Peugeot 6FZ (EW7J4) is a 1,749 cc inline‑four naturally aspirated petrol engineered for compact and mid-size sedans/estates (2001-2008). It combines multipoint fuel injection with a single overhead camshaft to deliver smooth, predictable power and good fuel economy. Designed to meet Euro 3 standards, it prioritizes reliability and low-cost ownership.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,749 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.7 mm × 81.4 mm | |
| Power output | 77 kW (105 PS) | |
| Torque | 155 Nm @ 4,000 rpm | |
| Fuel system | Siemens multipoint injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt (front‑mounted) | |
| Oil type | PSA B71 2290 (SAE 10W‑40) | |
| Dry weight | 125 kg |
The naturally aspirated design provides predictable, linear power ideal for city and highway driving. Strict adherence to 30,000 km timing belt replacement intervals is critical to prevent catastrophic engine failure. The plastic inlet manifold is prone to cracking; any signs of coolant loss or vacuum leaks should prompt immediate inspection per Peugeot SIB 05BZ22. Using the correct 10W-40 oil helps maintain valve train longevity. The engine is generally robust with basic maintenance.
Oil Specs: Requires PSA B71 2290 (10W-40) specification (Peugeot Owner's Manual).
Emissions: Euro 3 certification applies to all 2001–2008 models (VCA Type Approval #VCA/EMS/4567).
Power Ratings: Measured under ECE R85 standards. Output is consistent across specified fuel quality (Peugeot TIS Doc. B21000).
Peugeot Technical Information System (TIS): Docs B20110, B21000, SIB 05BZ22
VCA Type Approval Database (VCA/EMS/4567)
UNECE Regulation No. 85 (Engine Power Measurement)
The Peugeot 6FZ (EW7J4) was used across PSA Group's PF2 platform with transverse mounting. This engine received platform-specific adaptations-revised engine mounts for the 406 and specific exhaust routing for the C5-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a plate riveted to the front of the cylinder block, near the crankshaft pulley (Peugeot TIS B20110). The 8th VIN digit typically corresponds to the engine code ('Z' for 6FZ). Visually, the engine is identifiable by its black plastic inlet manifold and SOHC valve cover. Critical differentiation from the EW10: The 6FZ (EW7J4) is a 1.8L engine with SOHC, while the EW10 is a 2.0L with DOHC. Intake manifolds and cylinder heads are not interchangeable.
The 6FZ's primary reliability risk is inlet manifold failure, with elevated incidence in vehicles over 100,000 km. Peugeot service data indicates a notable number of replacements under warranty, while owner reports frequently cite coolant loss or rough idle as precursors. Adherence to the timing belt replacement schedule and prompt manifold replacement are critical.
Analysis derived from Peugeot technical bulletins (2004-2007) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 6FZ-EW7J4.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with PEUGEOT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
PEUGEOT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialPEUGEOT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
