The Peugeot LFY (XU7JP4) is a 1,761 cc, inline‑four, naturally aspirated petrol engine produced between 1997 and 2006. It features a cast‑iron block, aluminum head, and a dual overhead camshaft design driven by a timing belt. Peak output is 76 kW (103 PS) and 155 Nm of torque, providing balanced performance for compact family hatchbacks.
Fitted to models like the 306 S16, 406, and Citroën Xsara, the LFY was engineered for spirited driving with everyday practicality. Emissions compliance was achieved through multi-point fuel injection and catalytic converters, meeting Euro 2 standards for its production period.
One documented concern is premature failure of the plastic timing belt tensioner pulley, which can lead to belt slippage or breakage. This issue, referenced in Peugeot Technical Note 99‑05, is often caused by material fatigue under high heat cycles. Later XU7 variants transitioned to metal tensioner components for improved durability.
Production years 1997–2006 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/8901).
The Peugeot LFY (XU7JP4) is a 1,761 cc inline‑four petrol engine engineered for compact and mid-size hatchbacks/sedans (1997-2006). It combines multi-point fuel injection with a DOHC 16-valve head to deliver responsive mid-range torque and improved emissions control. Designed to meet Euro 2 standards, it balances sporty character with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,761 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 81.4 mm | |
| Power output | 76 kW (103 PS) @ 5,750 rpm | |
| Torque | 155 Nm @ 4,000 rpm | |
| Fuel system | Multi-point fuel injection (Bosch Motronic) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 10.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven | |
| Oil type | ACEA A3 (SAE 10W‑40) | |
| Dry weight | 125 kg |
The DOHC 16-valve design offers a sporty character ideal for spirited driving but requires strict adherence to the 80,000 km timing belt replacement interval to prevent catastrophic interference engine damage. The plastic tensioner pulley is a known wear item; replace it with the updated metal version per Peugeot Technical Note 99-05 during every belt service. ACEA A3 10W-40 oil is recommended for optimal valve train protection. The high 10.4:1 compression ratio demands good quality 95 RON petrol for smooth operation and to prevent knocking.
Oil Specs: Requires ACEA A3 specification oil (Peugeot Service Manual 99-05). Mineral or semi-synthetic 10W-40 is typical.
Emissions: Euro 2 certification applies to all 1997-2006 production (VCA Type Approval #VCA/EMS/8901).
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across model range (Peugeot Group PT-2000).
Peugeot Technical Information System: Docs 99-05, EPC 1761B
VCA Type Approval Database (VCA/EMS/8901)
EEC Directive 80/1269 Power Measurement Standards
The Peugeot LFY (XU7JP4) was used across Peugeot's 306/406 platforms and Citroën's Xsara with transverse mounting. This engine received platform-specific adaptations-minor ECU mapping for dashboard integration-and no significant facelift revisions affecting core components during its production run, ensuring broad interchangeability. 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 timing belt cover (Peugeot Service Manual 99-05). The full designation "XU7JP4" or "LFY" will be visible. Visually, it is identifiable by its black plastic valve cover with "16V" embossed on it and the Bosch Motronic injection rail. Critical differentiation from the 2.0L XU10: The LFY has a smaller displacement (1.8L vs 2.0L) and a visibly shorter intake manifold. The plastic timing belt tensioner pulley is a key identifier for early models.
The LFY's primary reliability risk is timing belt failure due to tensioner pulley wear, with elevated incidence in high-mileage vehicles. Peugeot service data indicates the plastic tensioner is a common failure point by 100,000 km, while UK DVSA records show ignition coil faults as a frequent cause of MOT failures. Infrequent oil changes can accelerate camshaft wear, making adherence to the maintenance schedule critical.
Analysis derived from Peugeot technical bulletins (1997-2006) and UK DVSA failure statistics (2000-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT LFY-XU7JP.
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Regulation (EC) No 715/2007
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