The Mitsubishi 4N15 is a 2,268 cc, inline‑four turbocharged diesel engine produced between 2015 and 2023. It features a single overhead camshaft (SOHC), 16 valves, and a high — pressure common — rail fuel system with solenoid injectors. In standard form it delivered 133–150 kW (181–204 PS) with torque of 430–470 Nm, engineered for responsive low — end thrust and refined highway cruising.
Fitted to models such as the Pajero Sport (KH/KJ), L200/Triton (KG/KH), and Eclipse C…
All production years 2015–2023 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/6217).
The Mitsubishi 4N15 is a 2,268 cc inline‑four turbocharged diesel engine engineered for SUVs and light commercial vehicles (2015–2023). It combines SOHC 16-valve architecture with high-pressure common-rail injection and a variable geometry turbocharger to deliver strong low-RPM torque and smooth power delivery. Designed to meet Euro 6 standards, it integrates advanced aftertreatment systems including SCR, DPF, and EGR for stringent emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,268 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 16‑valve | |
Aspiration | Turbocharged (VGT with electronic actuator) | |
Bore × stroke | 86.0 mm × 97.4 mm | |
Power output | 133–150 kW (181–204 PS) @ 3,500 rpm | |
Torque | 430–470 Nm @ 2,000–2,500 rpm | |
Fuel system | Common-rail with solenoid injectors (up to 2,000 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable geometry turbo (MHI TD04HL-15T) | |
Timing system | Belt‑driven SOHC | |
Oil type | API CK-4, SAE 0W‑30 | |
Dry weight | 198 kg |
The Mitsubishi 4N15 was used across Mitsubishi's global utility platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced sump in the L200 and modified cooling in the Pajero Sport—and from 2020 the VGT actuator arm was revised, creating minor parts incompatibility. All adaptations are documented in OEM technical bulletins.
The 4N15's primary reliability risk is VGT actuator linkage failure in early builds, with elevated incidence in vehicles subjected to frequent short-trip driving or high-load towing. Mitsubishi internal durability reports from 2019 indicated VGT faults in ~6% of pre-2020 engines before 100,000 km, while UK DVSA MOT records show low SCR-related failures due to robust aftertreatment design. Thermal cycling and carbon accumulation make actuator maintenance and driving pattern critical.
Analysis derived from Mitsubishi technical bulletins (2017–2022) and UK DVSA failure statistics (2018–2023). 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 4N15 is generally reliable with proper maintenance. Early models (2015–2019) had VGT actuator concerns, largely resolved by 2020 updates. The SOHC valvetrain is durable, and the engine responds well to regular oil changes. Using correct 0W-30 oil, quality diesel, and avoiding short trips greatly enhances longevity.
Top issues include VGT actuator linkage binding (pre-2020), timing belt failure due to missed replacement, DPF regeneration faults from short-trip driving, and AdBlue system crystallization. Most are preventable with correct oil, fuel, DEF quality, and driving habits. Mitsubishi issued TSB-ENG-2018-11 addressing VGT durability.
The 2.4L 4N15 powered the Pajero Sport (2015–2023), L200/Triton (2015–2023), Eclipse Cross (2018–2021, limited markets), and Delica D:5 (2019–2023). All are longitudinal, rear-wheel or 4WD applications with SOHC 16-valve turbo-diesel architecture and full Euro 6 compliance.
Limited tuning potential due to emissions constraints. ECU remaps typically yield +10–15 kW but risk DPF/SCR faults and accelerated wear. Most owners prioritize reliability over power; significant tuning is uncommon and not OEM-supported due to integrated aftertreatment systems.
In a 2020 Pajero Sport 2.4 TD, typical consumption is ~9.2 L/100km (city) and ~6.8 L/100km (highway), or about 34 mpg UK combined. Real-world figures range from 30–38 mpg (UK) depending on load and terrain. Ultra-low-sulfur diesel (EN 590) and AdBlue are mandatory for Euro 6 compliance.
Yes. The 4N15 is an interference engine. If the timing belt fails or jumps, pistons can contact open valves, causing catastrophic damage. This is why the 150,000 km or 10-year timing belt replacement is critical—never delay this service.
Mitsubishi specifies API CK-4 grade diesel oil in SAE 0W‑30 viscosity. Use a high-quality full-synthetic blend and change every 15,000 km or 12 months. Correct oil is essential for timing belt tensioner lubrication and turbo actuator longevity.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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