The Fiat 4HV is a 1,956 cc, inline-four turbo-diesel engine produced between 2008 and 2014. It belongs to the MultiJet family of diesel engines, featuring second-generation common-rail direct injection with piezoelectric injectors. With a dual overhead camshaft (DOHC) 16-valve configuration and variable geometry turbocharger (VGT), it delivers 88 kW (120 PS) with 300 Nm of torque. This design prioritises strong low-end pulling power and fuel efficiency for compact MPVs and light commercial vehicles.
Fitted to models such as the Fiat Scudo (225), Fiat Ducato (244), and Peugeot Boxer (225), the 4HV was engineered for utility-focused buyers requiring dependable performance and load-carrying capability. It meets Euro 5 emissions standards through exhaust gas recirculation (EGR), diesel particulate filter (DPF), and precise injection control. The engine's robust construction and commercial-grade components support high-mileage operation under load.
One documented concern is premature diesel particulate filter (DPF) clogging, particularly in vehicles used for short urban trips. This issue, referenced in Fiat Service Information Bulletin 45 001 10, stems from insufficient regeneration cycles due to inadequate highway driving. From 2011 onward, Fiat revised the ECU mapping to initiate passive regeneration at lower exhaust temperatures, improving DPF longevity.
All production units comply with Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/5432).
The Fiat 4HV is a 1,956 cc inline-four turbo-diesel engine designed for commercial and multi-purpose applications (2008–2014). It combines second-generation MultiJet common-rail injection with a variable geometry turbocharger to deliver strong low-end torque and efficient load-carrying performance. Engineered to meet Euro 5 standards, it balances payload capability with emissions compliance for European fleet and utility use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,956 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 83.0 mm × 90.4 mm | |
| Power output | 88 kW (120 PS) @ 3,500 rpm | |
| Torque | 300 Nm @ 1,500–2,500 rpm | |
| Fuel system | Common-rail MultiJet II (up to 1,600 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (IHI RHF4) | |
| Timing system | Timing belt (interval: 120,000 km) | |
| Oil type | SAE 5W-30 (API CJ-4 or ACEA B4) | |
| Dry weight | 185 kg |
The VGT turbo provides strong low-RPM torque ideal for loaded driving but requires adherence to 15,000 km oil change intervals to maintain turbo and injector longevity. SAE 5W-30 oil meeting API CJ-4 or ACEA B4 specifications is essential to protect high-pressure components. Extended idling or frequent short trips may accelerate DPF clogging due to incomplete regeneration cycles. The MultiJet II system is sensitive to fuel quality, requiring ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent injector fouling. Post-2011 models feature revised ECU mapping for improved DPF regeneration; pre-2011 units should have the update applied per Fiat SIB 45 001 10. Regular highway runs are recommended to maintain DPF health and prevent limp-mode events.
Oil Specs: Requires SAE 5W-30 meeting API CJ-4 or ACEA B4 (Fiat SIB 45 001 10). Use of lower-spec oils increases injector and turbo wear risk.
Emissions: All models meet Euro 5 standards (VCA Type Approval #VCA/EMS/5432). No Euro 5b or Euro 6 variants exist for this engine code.
Power Ratings: Measured under ECE R85 standards. Output optimised for load-carrying performance (Fiat TIS Doc. MJ-II-004).
Fiat Technical Information System (TIS): Docs MJ-II-004, SIB 45 001 10
VCA Type Approval Database (VCA/EMS/5432)
ECE Regulation No. 85 (Engine Power Measurement)
The Fiat 4HV was used across Fiat's 225/244 platforms with transverse mounting and shared with Peugeot and Citroën under the Sevel joint venture. This engine received platform-specific adaptations-reinforced mounts in the Ducato and shortened intake paths in the Scudo-and from 2011 the facelifted Scudo II adopted revised ECU mapping, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side engine block near the oil filter housing (Fiat TIS MJ-II-004). The 8th VIN digit indicates engine type ('K' for 1.9L JTD). Pre-2011 models have a silver valve cover with a black plastic cam cover; post-2011 units use an all-black cover. Critical differentiation from 2.3L units: The 4HV uses a timing belt and 1.9L displacement, while 2.3L variants use a timing chain. Service parts require production date verification—timing belts for pre-2011 models are not compatible with later units due to ECU and DPF mapping changes (Fiat SIB 45 001 10).
The 4HV's primary reliability risk is DPF clogging on early builds, with elevated incidence in vehicles used for short urban trips. Internal Fiat quality reports from 2010 indicated a measurable number of pre-2011 engines requiring DPF cleaning or replacement before 100,000 km, while UK DVSA data links a portion of emissions-related MOT failures to EGR valve malfunction in stop-start traffic. Delayed servicing and poor fuel quality increase system stress, making regular maintenance critical.
Analysis derived from Fiat technical bulletins (2008–2013) and UK DVSA failure statistics (2010–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 4-HV.
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