The Peugeot 3FY (EW12J4) is a 2,231 cc, inline‑four naturally aspirated petrol engine produced between 2004 and 2010. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. This engine delivered a balance of 123 kW (167 PS) and 220 Nm of torque, with variable valve timing (VVT) enabling smooth power delivery across the rev range.
Fitted primarily to the Peugeot 607 sedan and Citroën C6 executive models, the 3FY was engineered fo…
Production years 2004–2010 meet Euro 4 standards .
The Peugeot 3FY (EW12J4) is a 2,231 cc inline‑four naturally aspirated petrol engine engineered for executive sedans (2004-2010). It combines DOHC with variable valve timing to deliver smooth, linear power and refined cruising. Designed to meet Euro 4 standards, it balances adequate performance with acceptable fuel economy for its class.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,231 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 86.0 mm × 96.0 mm | |
Power output | 123 kW (167 PS) @ 5,875 rpm | |
Torque | 220 Nm @ 4,150 rpm | |
Fuel system | Sequential multi-point injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | PSA B71 2290 (SAE 5W‑40) | |
Dry weight | 165 kg |
The Peugeot 3FY (EW12J4) was used exclusively in PSA Group's large executive platforms with longitudinal mounting. This engine received minimal platform-specific adaptations and was shared directly between the Peugeot 607 and Citroën C6. All adaptations are documented in OEM technical bulletins.
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The 3FY (EW12J4)'s primary reliability risk is variable valve timing (VVT) system failure, with elevated incidence in vehicles with extended oil change intervals. PSA internal data indicates a notable number of solenoid replacements before 100,000 km, while timing chain tensioner wear becomes a concern after 150,000 km. Neglecting oil changes and using incorrect viscosity make VVT component failure highly probable.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The 3FY engine is generally robust mechanically, with a durable chain-driven timing system. Its main weakness is the VVT system, which is sensitive to oil quality and change intervals. With strict adherence to using PSA B71 2290 oil and changing it every 15,000 km, the engine can be very reliable. Neglecting this will almost certainly lead to expensive VVT repairs.
The most frequent issues are VVT solenoid or phaser failure, timing chain tensioner wear (after high mileage), coolant leaks from the plastic thermostat housing, and problems with the variable intake manifold runners. These are well-documented in PSA service bulletins and owner reports.
The 3FY (EW12J4) 2.2L petrol engine was used almost exclusively in the Peugeot 607 executive sedan from 2004 to 2010. It was also fitted to the mechanically similar Citroën C6 from 2005 to 2010. It was not used in smaller Peugeot models like the 307 or 407, which used different engine families.
Yes, but gains are modest. Since it's naturally aspirated, significant power increases require internal modifications. ECU remaps can yield 5-10 kW by optimizing ignition and fuel curves. More substantial gains come from intake/exhaust upgrades and high-flow catalytic converters. It's not a common tuning target due to its application in luxury sedans.
Fuel economy is typical for a 2.2L NA petrol engine in a large car. Expect around 11.5 L/100km (25 mpg UK) in city driving and 7.5 L/100km (38 mpg UK) on the highway. Combined figures are usually around 9.0-9.5 L/100km (30-31 mpg UK), heavily dependent on driving style and vehicle condition.
Yes. The 3FY (EW12J4) is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing catastrophic internal engine damage. This underscores the importance of addressing any timing chain rattle immediately.
Peugeot mandates the use of oil meeting the PSA B71 2290 specification, typically a 5W-40 synthetic. Using the correct oil is absolutely critical for the longevity of the variable valve timing system. ACEA A3/B4 is the minimum acceptable industry standard if the PSA-specific oil is unavailable.
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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Type-approval guidance and documentation.
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