The Peugeot NFX (TU5J4) is a 1,587 cc, inline‑four petrol engine produced between 1997 and 2006. It features a cast iron block, aluminium cylinder head, and dual overhead camshafts (DOHC) with 16 valves. This naturally aspirated unit delivered 74 kW (100 PS) and 140 Nm of torque, offering a balance of responsiveness and everyday fuel economy.
Fitted to models such as the 206, 306, and Partner van, the NFX was engineered for urban agility and reliable daily commuting. Emissi…
Production years 1997–2006 meet Euro 3 standards .
The Peugeot NFX (TU5J4) is a 1,587 cc inline‑four petrol engine engineered for compact hatchbacks and light commercial vehicles (1997-2006). It combines multi-point fuel injection with a DOHC 16-valve head to deliver responsive low-to-mid range power. Designed to meet Euro 3 standards, it balances urban drivability with reasonable fuel consumption.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,587 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.5 mm × 82.0 mm | |
Power output | 74 kW (100 PS) @ 5,800 rpm | |
Torque | 140 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (Bosch Motronic) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven (requires periodic replacement) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 112 kg |
The Peugeot NFX (TU5J4) was used across Peugeot's 20x/30x platforms with transverse mounting. This engine received platform-specific adaptations-reinforced mounts in the Partner van variant-and shared its core architecture with the Citroën TU5JP4 engine, creating broad parts compatibility. All adaptations are documented in OEM technical bulletins.
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The NFX's primary reliability risk is inlet camshaft lobe wear, with elevated incidence in high-mileage or poorly maintained engines. Peugeot internal reports from the early 2000s noted this as a recurring service issue, while adherence to strict oil and timing belt schedules significantly mitigates failure risk. Extended service intervals and use of incorrect oil make preventative maintenance critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 NFX can be very reliable long-term if meticulously maintained. The critical factors are using the correct ACEA A3/B4 oil and changing it frequently (every 10,000 km), and replacing the timing belt every 60,000 km. Addressing the known camshaft wear issue in early models is key to longevity.
The most common issues are premature inlet camshaft lobe wear (especially pre-2002), timing belt failure due to neglected replacement, coolant leaks from the plastic thermostat housing, and erratic idle caused by a faulty idle control valve. These are well-documented in Peugeot service information.
The NFX engine was primarily used in the Peugeot 206 (1998-2006) and 306 (1997-2001) in their sportier 1.6 S16/XT/XS trims. It was also fitted to the Peugeot Partner van (1997-2006) and its Citroën equivalent, the Berlingo. The Citroën Saxo VTR/VTS also used this engine.
Aftermarket ECU tuning is common on the NFX-TU5J4 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is respectable for its era. In a Peugeot 206 1.6, expect around 8.5 L/100km in the city and 5.5 L/100km on the highway, translating to roughly 33 mpg UK combined. Actual figures depend heavily on driving style and vehicle condition.
Yes. The NFX is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing significant and expensive internal engine damage. This makes adhering to the 60,000 km belt replacement schedule absolutely critical.
Peugeot mandates an oil meeting the ACEA A3/B4 specification. A 10W-40 or 5W-40 viscosity is recommended. Using a high-quality, fully synthetic oil that meets this spec is crucial for protecting the camshafts and ensuring engine longevity, especially in pre-2002 models.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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