The Citroën NFS (engine code TU5JP4) is a 1,360 cc, inline-four naturally aspirated petrol engine produced between 1999 and 2011. Developed by PSA Group, it features a cast-iron block, aluminium head, and multi-point fuel injection (MPFI), delivering 74 kW (101 PS) at 5,750 rpm and 130 Nm of torque at 4,250 rpm. With a timing belt-driven DOHC valvetrain and 11.0:1 compression ratio, it was engineered for reliability and cost-effective servicing.
Fitted to compact models including the Citroën Saxo, C2, and C3, the TU5JP4 was designed for urban and regional driving, emphasizing fuel efficiency and low maintenance costs. It met Euro 3 emissions standards through a three-way catalytic converter and closed-loop lambda control, with later models (2006+) achieving Euro 4 compliance via refined engine management calibration.
One documented concern is premature camshaft wear observed in certain 2003–2005 production batches, linked to inadequate lubrication in the camshaft lobes. This issue, referenced in PSA Service Bulletin SIB-ENG-2005-12, led to revised oil pump flow specifications and updated camshaft metallurgy. From 2006, the TU5JP4 received minor revisions to the intake manifold and ECU mapping to improve throttle response and cold-start stability.
Production years 1999–2005 meet Euro 3 standards; 2006–2011 models comply with Euro 4 depending on market (VCA UK Type Approval #VCA/EMS/8765).
The Citroën TU5JP4 is a 1,360 cc inline-four naturally aspirated petrol engine engineered for compact hatchbacks (1999–2011). It combines a robust iron-block design with multi-point fuel injection to deliver reliable everyday performance and low ownership costs. Designed to meet Euro 3 and later Euro 4 standards, it balances efficiency with durability in urban environments.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,360 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 70.0 mm | |
| Power output | 74 kW (101 PS) @ 5,750 rpm | |
| Torque | 130 Nm @ 4,250 rpm | |
| Fuel system | Multi-point fuel injection (Siemens Simos 3P) | |
| Emissions standard | Euro 3 (1999–2005); Euro 4 (2006–2011) | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (DOHC, front-mounted) | |
| Oil type | Total Multis 5W-30 (PSA B71 2100) | |
| Dry weight | 102 kg |
The naturally aspirated design provides linear throttle response ideal for city driving but requires strict adherence to 60,000 km or 4-year timing belt replacement intervals to prevent camshaft damage. Total Multis 5W-30 oil meeting PSA B71 2100 specification is critical for maintaining cam lobe lubrication and preventing premature wear. The Siemens Simos 3P engine management system is robust but sensitive to vacuum leaks and worn spark plugs. Pre-2006 engines with known cam wear should be inspected for lobe pitting; updated camshafts were introduced in 2005 per PSA SIB-ENG-2005-12. Lambda sensor health should be monitored to maintain emissions compliance and fuel economy.
Oil Specs: Requires PSA B71 2100 specification (PSA SIB-ENG-2005-12). Compatible with ACEA A2 but not a substitute.
Emissions: Euro 3 applies to 1999–2005 models (VCA Type Approval #VCA/EMS/8765). Euro 4 compliance from 2006 onward varies by market.
Power Ratings: Measured under ECE R85 standards. Output consistent across fuel grades (RON 95 minimum).
PSA Technical Information System (TIS): Docs P15000, P15120, SIB-ENG-2005-12
VCA Type Approval Database (VCA/EMS/8765)
ISO 1585:1992 Road vehicles — Test code for net power
The Citroën NFS (TU5JP4) was used across Citroën's B-segment platforms with transverse mounting and shared with Peugeot under PSA Group standardization. This engine received platform-specific calibrations—tuned idle control in the C3 and revised intake tuning in the Saxo—and from 2006, Euro 4-compliant variants featured updated ECU mapping and oxygen sensor integration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side of the cylinder block near the transmission bellhousing (PSA TIS P15000). The 8th VIN digit indicates engine type ('F' for TU5JP4). Pre-2006 models have a silver valve cover with black plastic timing cover; post-2006 units use a black valve cover. Critical differentiation from TU5JP: TU5JP4 has 16 valves and DOHC, while TU5JP (8v) uses SOHC and 8 valves. Service parts require model-year verification—timing belts and camshafts for engines before 2005 are not interchangeable with post-revision units due to metallurgy changes (PSA SIB-ENG-2005-12).
The TU5JP4's primary reliability risk is camshaft lobe wear, with elevated incidence in high-mileage and poorly maintained engines. PSA internal field reports from 2006 indicated a significant share of pre-2006 units required camshaft replacement before 120,000 km, while UK DVSA data shows increased catalytic converter failures in vehicles with delayed servicing. Extended timing belt intervals and low-quality oil exacerbate wear, making adherence to maintenance schedules critical.
Analysis derived from PSA technical bulletins (2003–2010) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN NFS-TU5JP4.
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