The Citroën NFX, known internally as TU5JP4, is a 1,360 cc, inline-four naturally aspirated petrol engine produced between 1998 and 2011. It features a DOHC 16-valve configuration, sequential multi-point fuel injection (MPFI), and variable intake geometry (ViVA). In standard tune, it delivers 80 kW (109 PS) at 6,000 rpm and 135 Nm of torque at 4,400 rpm, primarily used in compact and supermini platforms.
Fitted to models such as the Citroën C3, C4, and Peugeot 206, the TU5JP4 was engineered for responsive urban driving and fuel-efficient operation. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, allowing Euro 3 and later Euro 4 compliance across its production run. The engine’s high-revving character made it ideal for lightweight hatchbacks.
One documented concern is premature exhaust camshaft wear, particularly in early production units (pre-2003). This issue, highlighted in PSA Service Bulletin 12/1045, is attributed to marginal oil flow to the cam journals under sustained high-RPM operation. From 2003 onward, revised oil gallery machining and updated bearing clearances were implemented to improve durability.
Production years 1998–2005 meet Euro 3 standards; 2006–2011 models comply with Euro 4 depending on market (VCA UK Type Approval #VCA/EMS/7890).
The Citroën NFX (TU5JP4) is a 1,360 cc inline-four naturally aspirated petrol engine designed for compact urban vehicles (1998–2011). It combines DOHC 16-valve architecture with variable intake geometry (ViVA) to enhance mid-range torque and throttle response. Designed to meet Euro 3 and later Euro 4 standards, it balances efficiency with drivability in lightweight applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,360 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 70.0 mm | |
| Power output | 80 kW (109 PS) @ 6,000 rpm | |
| Torque | 135 Nm @ 4,400 rpm | |
| Fuel system | Siemens sequential MPFI | |
| Emissions standard | Euro 3 (1998–2005); Euro 4 (2006–2011) | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (renew every 120,000 km or 6 years) | |
| Oil type | Total Multis 10W-40 | |
| Dry weight | 108 kg |
The DOHC 16-valve layout provides strong top-end power ideal for city driving but requires strict adherence to 120,000 km or 6-year timing belt replacement intervals to prevent valve damage. Total Multis 10W-40 oil is recommended due to its thermal stability under high-RPM operation. Extended high-speed driving without cooldown periods increases risk of camshaft wear, particularly in pre-2003 engines. The Siemens MPFI system is robust but sensitive to low-quality fuel; use of EN 228-compliant petrol prevents injector fouling. Post-2003 models feature improved oil flow to the exhaust cam; pre-2003 units should be inspected per PSA SIB 12/1045. The engine’s high compression ratio benefits from 98 RON fuel under sustained load.
Oil Specs: Requires Total Multis 10W-40 specification (PSA SIB 12/1045). Meets ACEA A3/B3 standards.
Emissions: Euro 3 certification applies to 1998–2005 models (VCA Type Approval #VCA/EMS/7890). Euro 4 compliance from 2006 varies by market.
Power Ratings: Measured under ECE R85 standards. 80 kW output requires 95 RON fuel for optimal performance (PSA TIS Doc. B12680).
PSA Technical Information System (TIS): Docs B12680, B12701, SIB 12/1045
VCA Type Approval Database (VCA/EMS/7890)
European Regulation (EC) No 715/2007
The Citroën NFX (TU5JP4) was used across Citroën's B-segment platforms with transverse mounting and shared with Peugeot and Toyota under platform-sharing agreements. This engine received platform-specific calibrations-adaptive throttle mapping in the C4 and revised intake manifolds in the C3-and from 2006, Euro 4-compliant variants introduced updated lambda sensors and EGR flow rates, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (PSA TIS B12690). The 8th VIN digit indicates engine type ('F' for TU5 series). Pre-2003 models have silver cam covers with exposed valve springs; post-2003 units feature revised oil deflectors. Critical differentiation from TU5JP: TU5JP4 has DOHC 16-valve head and ViVA intake, while TU5JP is SOHC 8-valve. Service parts require model-year verification - timing belts for pre-2003 engines are not compatible with later Euro 4 variants due to revised tensioner design (PSA SIB 12/1045).
The TU5JP4's primary reliability risk is exhaust camshaft wear on early builds, with elevated incidence in high-RPM urban driving. PSA internal quality reports from 2004 indicated a significant share of pre-2003 units required cam replacement before 120,000 km, while UK DVSA MOT records show increased emissions failures linked to valve timing drift in high-mileage examples. Extended high-speed operation and delayed oil changes exacerbate wear, making timing belt and lubrication maintenance critical.
Analysis derived from PSA technical bulletins (2002-2010) and UK DVSA failure statistics (2005-2015). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN NFX-TU5JP4.
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