The Peugeot 3FZ (EW12J4) is a 2,231 cc, inline‑four naturally aspirated petrol engine produced between 2001 and 2010. It features a dual overhead camshaft (DOHC) design with 16 valves and electronic fuel injection, delivering outputs between 115 kW (156 PS) and 122 kW (165 PS) with torque figures of 217–220 Nm. Variable valve timing (VVT) on the intake camshaft optimises power delivery across the rev range.
Fitted to models such as the 407, 607, and C5, the 3FZ (EW12J4) was e…
Production years 2001–2005 meet Euro 3 standards; 2006–2010 models meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Peugeot 3FZ (EW12J4) is a 2,231 cc inline‑four naturally aspirated petrol engineered for executive sedans and estates (2001-2010). It combines electronic fuel injection with variable valve timing to deliver smooth, linear power and refined cruising. Designed to meet Euro 3 and Euro 4 standards, it balances performance with acceptable emissions.
| 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 | 115–122 kW (156–165 PS) | |
Torque | 217–220 Nm @ 4,000 rpm | |
Fuel system | Sequential multi‑point injection (Bosch ME7.4.4) | |
Emissions standard | Euro 3 (2001–2005); Euro 4 (2006–2010) | |
Compression ratio | 10.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven (intake cam VVT pulley) | |
Oil type | Peugeot 9736.A3 (SAE 5W‑40) | |
Dry weight | 148 kg |
The Peugeot 3FZ (EW12J4) was used across Peugeot's PF3 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 607 and revised intake manifolds for the C5-and from 2006 the facelifted models adopted updated emissions hardware to meet Euro 4, creating minor ECU calibration differences. All adaptations are documented in OEM technical bulletins.
The 3FZ (EW12J4)'s primary reliability risk is dephaser pulley failure, with elevated incidence in vehicles subjected to extended oil change intervals. Peugeot internal service data indicates a notable failure rate after 100,000 km in poorly maintained engines, while general owner reports frequently cite the resulting rattle and loss of performance. Use of incorrect oil viscosity or infrequent changes accelerates wear, making adherence to the specified 5W-40 oil and service schedule critical.
Analysis derived from Peugeot technical bulletins (2005-2010) and owner-reported failure data (2010-2023). 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 3FZ (EW12J4) is generally robust with a strong bottom end, but its Achilles' heel is the dephaser pulley. With strict adherence to oil changes using 5W-40 and timely pulley replacement if issues arise, these engines can easily surpass 200,000 km. Neglecting the VVT system is the primary cause of major failures.
The most frequent issues are dephaser pulley failure (causing rattle and performance loss), coolant leaks from the plastic thermostat housing, ignition coil pack failures leading to misfires, and oil leaks from the rocker cover gasket. These are well-documented in Peugeot service information.
This 2.2L petrol engine was primarily used in Peugeot's larger models from the early 2000s, including the 407 (2004-2010), 607 (2001-2010), and C5 (2001-2008). It was not used in smaller models like the 206 or 307.
Yes, but gains are modest. An ECU remap can yield around +10-15 kW by optimizing ignition and fuel maps. Significant power increases require forced induction (turbo/supercharger), which is complex and costly. Most tuning focuses on drivability and throttle response rather than large power gains.
Expect combined fuel economy of approximately 9.5-10.5 L/100km (27-25 mpg UK) in a Peugeot 407 or 607. Real-world figures vary greatly with driving style, but it's not considered a particularly economical engine due to its size and the weight of the vehicles it powers.
Yes. The 3FZ (EW12J4) is an interference engine. If the timing chain were to fail (a rare occurrence) or if the cam timing is severely disrupted (e.g., by a failed dephaser pulley), piston-to-valve contact is possible, resulting in significant internal engine damage.
Peugeot mandates a 5W-40 synthetic oil meeting their specific 9736.A3 standard (or equivalent ACEA A3/B4). Using the correct viscosity and specification is absolutely critical for the longevity of the variable cam timing dephaser pulley. Change intervals should not exceed 15,000 km or 1 year.
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
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