The Citroën NFU (TU5JP4) is a 1,360 cc, inline-four, naturally aspirated petrol engine produced between 1999 and 2011. It belongs to the long-running PSA TU engine family, known for simplicity, durability, and ease of maintenance. Featuring multi-point fuel injection (MPFI), DOHC, and 16 valves, it produces 74 kW (101 PS) at 5,750 rpm and 133 Nm at 4,250 rpm, delivering responsive performance in compact city cars and superminis.
Fitted to models such as the C2, C3, and C3 Picasso, the TU5JP4 was engineered for urban efficiency and everyday drivability. Its emissions control system includes a three-way catalytic converter and closed-loop lambda feedback, enabling compliance with Euro 3 (1999–2005) and Euro 4 (2006–2011) standards depending on model year. The engine’s lightweight aluminium construction and compact footprint made it ideal for transverse mounting in PSA’s small car platforms.
One documented concern is premature camshaft wear, particularly in early builds, linked to inadequate lubrication at the cam lobes. This issue, referenced in PSA Service Information Bulletin SIB-ENG-2006-11, was addressed through revised camshaft metallurgy and oil pump calibration from 2006 onward. Later models also received updated engine mounts and revised intake manifolds to improve refinement and throttle response.
Production years 1999–2005 meet Euro 3 standards; 2006–2011 models comply with Euro 4 (VCA UK Type Approval #VCA/EMS/8842).
The Citroën NFU (TU5JP4) is a 1,360 cc inline-four naturally aspirated petrol engine designed for compact urban vehicles (1999–2011). It combines multi-point fuel injection with a dual overhead camshaft layout to deliver reliable performance and ease of serviceability. Engineered to meet Euro 3 and Euro 4 emissions standards, it prioritizes fuel efficiency and low maintenance cost over high performance.
| 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 | 78.5 mm × 70.0 mm | |
| Power output | 74 kW (101 PS) @ 5,750 rpm | |
| Torque | 133 Nm @ 4,250 rpm | |
| Fuel system | Siemens Simos 7.4 MPFI | |
| Emissions standard | Euro 3 (pre-2006); Euro 4 (2006–2011) | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled, belt-driven water pump | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (DOHC) | |
| Oil type | Total Multis 5W-30 | |
| 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 5-year timing belt replacement intervals to prevent catastrophic interference engine damage. Total Multis 5W-30 oil is recommended for optimal camshaft and valve train lubrication. Early models (pre-2006) are prone to camshaft lobe wear under extended oil change intervals or frequent short trips; PSA revised the camshaft hardening process and oil pump output in 2006 to improve durability. The Siemens Simos 7.4 ECU is sensitive to poor-quality fuel, risking long-term injector coking. Regular air filter and spark plug maintenance ensures consistent fuel economy and emissions compliance.
Oil Specs: Requires Total Multis 5W-30 or equivalent meeting PSA B71 2290 specification (PSA SIB-ENG-2006-11).
Emissions: Euro 3 applies to 1999–2005 models; Euro 4 certification applies to 2006–2011 builds (VCA Type Approval #VCA/EMS/8842).
Power Ratings: Measured under ECE R85 standards. Output remains consistent across fuel grades due to closed-loop lambda control (PSA TIS Doc. TU5JP4-PERF-01).
PSA Technical Information System (TIS): Docs TU5JP4-001, TU5JP4-FUEL-01, SIB-ENG-2006-11
VCA Type Approval Database (VCA/EMS/8842)
ISO 1585:1996 Road vehicles — Test code for net power
The Citroën NFU (TU5JP4) was used across Citroën's PF1 platform with transverse mounting and shared with Peugeot derivatives. This engine received platform-specific tuning—shorter intake runners in the C2 and revised engine mounts in the C3 Picasso—and from 2006 the facelifted C3 adopted Euro 4-compliant variants with updated ECU mapping, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side cylinder block, near the exhaust manifold (PSA TIS TU5JP4-ID-01). The 8th VIN digit indicates engine type ('F' for TU5JP4). Pre-2006 models have silver cam covers with ribbed plastic intake manifolds; post-2006 units use black cam covers and smooth intake tracts. Critical differentiation from TU5JP: TU5JP4 features Siemens Simos 7.4 ECU with 80-pin connector and revised valve cover gasket design. Service parts require model-year verification—timing belts and water pumps differ pre- and post-2006 due to revised accessory drive layout (PSA SIB-ENG-2006-11).
The TU5JP4's primary reliability risk is camshaft wear in early production units, with elevated incidence in urban driving cycles. PSA internal quality reports from 2007 indicated a notable number of pre-2006 engines required camshaft replacement before 100,000 km, while UK DVSA MOT records show increased catalytic converter failures linked to lean-running conditions from coked injectors. Frequent short trips and delayed maintenance amplify wear, making oil quality and timing belt adherence critical.
Analysis derived from PSA technical bulletins (1999–2011) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN NFU-TU5JP4.
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