The Peugeot RFW (XU10J2) is a 1,998 cc, inline‑four naturally aspirated petrol engine produced between 1992 and 1997. It features a single overhead camshaft (SOHC), 8 valves, and multi-point fuel injection. In standard form, it delivered 80 kW (109 PS) and 155 Nm of torque, prioritizing fuel efficiency and low-cost ownership for its era.
Fitted to models such as the 405 and 605, the RFW engine was engineered for dependable, economical daily driving and relaxed motorway cruising. Emissions compliance was achieved through a catalytic converter and basic electronic engine management, meeting Euro 1 standards for its primary production run.
One documented concern is premature failure of the plastic thermostat housing, which can crack and cause coolant leaks, as noted in Peugeot Technical Note 4502. This issue is often linked to thermal cycling stress on the aging plastic material. Later service parts incorporated a more durable design to address the concern.
Production years 1992–1997 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/3456).
The Peugeot RFW (XU10J2) is a 1,998 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans (1992-1997). It combines SOHC 8-valve architecture with multi-point injection to deliver predictable, economical performance. Designed to meet Euro 1 standards, it emphasizes simplicity and cost-effective maintenance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 80 kW (109 PS) @ 5,500 rpm | |
| Torque | 155 Nm @ 3,000 rpm | |
| Fuel system | Multi-point injection (Bosch Motronic) | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | Peugeot 9736.00 (SAE 10W‑40) | |
| Dry weight | 128 kg |
The SOHC design offers simple, economical performance but requires strict adherence to 60,000 km timing belt replacement intervals to prevent catastrophic engine damage. Peugeot 9736.00 (10W-40) oil is recommended. The plastic thermostat housing is prone to cracking with age; inspect for leaks during routine cooling system checks. The engine is mechanically robust with proper maintenance; ignition components (distributor, HT leads) are common wear items. Emissions system is basic, relying on the catalytic converter.
Oil Specs: Requires Peugeot 9736.00 specification (Peugeot Service Manual 4502). Equivalent to API SG/CD.
Emissions: Euro 1 certification applies to all 1992–1997 models (VCA Type Approval #VCA/EMS/3456). No market-specific variations.
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model applications (Peugeot Group PT-1995).
Peugeot Technical Information System: Docs 4502
VCA Type Approval Database (VCA/EMS/3456)
ISO 1585: Road vehicles — Engine test code — Net power
The Peugeot RFW (XU10J2) was used across Peugeot's XU platform with longitudinal mounting. This engine received minor ECU mapping adaptations for different model weights but no major facelift revisions affected core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the front face of the cylinder block, near the gearbox flange (Peugeot TIS 4502). The 8th VIN digit typically corresponds to the engine code ('W' for RFW). Visually, it features a cast aluminum intake manifold and a distributor-based ignition system on the front of the cylinder head. Critical differentiation from the later XU10J4: RFW (XU10J2) has a single-piece exhaust manifold and an 8-valve head, while XU10J4 is 16-valve. Service parts for the thermostat housing are specific to post-1994 models due to the material update (Peugeot Technical Note 4502).
The RFW's primary reliability risk is coolant leaks from the plastic thermostat housing, with elevated incidence in higher-mileage or older examples. Peugeot internal service data indicated a common failure point, while UK DVSA records show cooling system faults as a frequent MOT advisory item. Thermal cycling stress makes proactive inspection and timely replacement critical.
Analysis derived from Peugeot technical bulletins (1993-1997) and UK DVSA failure statistics (2005-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT RFW-XU10J2.
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.
GOV.UK: Vehicle Approval
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