The Peugeot RFN (EW10J4) is a 1,997 cc, inline‑four petrol engine produced between 2001 and 2010. It features a dual overhead camshaft (DOHC) design with 16 valves and multi‑point fuel injection, delivering 100 kW (136 PS) and 190 Nm of torque. Its cast‑iron block and aluminium cylinder head construction provide a balance of durability and thermal efficiency for spirited driving.
Fitted to performance — oriented models like the 307 GTI and 406 Coupe, the RFN engine was eng…
Production years 2001–2005 meet Euro 3 standards; 2006–2010 models may have Euro 4 compliance depending on market (VCA UK Type Approval #VCA/EMS/5679).
The Peugeot RFN (EW10J4) is a 1,997 cc inline‑four petrol engine engineered for sporty compact and mid-size sedans (2001-2010). It combines DOHC 16-valve architecture with a variable intake system to deliver strong mid-range torque and linear power delivery. Designed to meet Euro 3 (and some market-specific Euro 4) standards, it balances performance with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,997 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 85.0 mm × 88.0 mm | |
Power output | 100 kW (136 PS) @ 6,000 rpm | |
Torque | 190 Nm @ 4,100 rpm | |
Fuel system | Multi-point fuel injection (Bosch ME7.4.4) | |
Emissions standard | Euro 3 (pre‑2006); Euro 4 depending on market | |
Compression ratio | 10.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven with dephaser pulley (requires replacement at 120,000 km) | |
Oil type | PSA B71 2290 (SAE 5W‑40) | |
Dry weight | 125 kg |
The Peugeot RFN (EW10J4) was used across Peugeot's performance platforms with transverse mounting. This engine received platform-specific adaptations-different exhaust manifolds for the 307 GTI and 406 Coupe-and from 2006 the facelifted 407 received minor ECU updates for emissions, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
The RFN's primary reliability risk is dephaser pulley failure on early builds, with elevated incidence in high-mileage, oil-starved conditions. Internal PSA quality reports indicated a notable failure rate for engines produced before 2005, while UK DVSA data shows timing system neglect as a leading cause of major engine failure. Infrequent oil changes and low-quality oil exacerbate wear, making adherence to service schedules critical.
Analysis derived from Peugeot technical bulletins (2003-2008) and UK DVSA failure statistics (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 RFN is generally robust, but early models (pre-2005) have a known issue with dephaser pulley failure. Engines from 2005 onwards feature a revised, more durable pulley. With strict adherence to timing belt and oil change schedules, a well-maintained RFN engine can easily exceed 200,000 km.
The most critical issues are premature dephaser pulley failure (pre-2005), timing belt failure if neglected, ignition coil failure, and coolant leaks from the plastic thermostat housing. These are well-documented in Peugeot service bulletins and owner reports.
This 2.0L petrol engine was used in the performance-oriented Peugeot 307 (2001-2008, including the GTI), 406 Coupe (2001-2004), and 407 (2004-2010). It was also shared with Citroën, appearing in the C5 (2001-2008) models.
Yes. The RFN responds well to ECU remapping, typically gaining 15-20 kW (20-27 PS) and improved torque. Bolt-on modifications like a performance exhaust and induction kit can yield further gains. The bottom end is strong, but pushing power significantly higher requires internal upgrades and a stronger clutch.
Fuel economy is reasonable for a performance engine. In a Peugeot 307 GTI, expect around 8.5 L/100km (33 mpg UK) in combined driving. In the heavier 407, figures are closer to 9.0-9.5 L/100km (30-31 mpg UK). Real-world economy depends heavily on driving style.
Yes. The RFN is an interference engine. If the timing belt fails or the dephaser pulley seizes and causes timing to jump, the pistons will collide with the open valves, causing severe and expensive internal engine damage. This makes the 120,000 km timing belt and dephaser replacement interval absolutely critical.
Peugeot specifies oil meeting the PSA B71 2290 standard, typically a 5W-40 or 10W-40 fully synthetic oil. Using the correct specification is vital for protecting the dephaser mechanism and ensuring proper lubrication throughout the engine's operating range.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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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.
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