The Mitsubishi 4N18 is a 2,268 cc, inline‑four turbo‑diesel engine introduced in 2019 as part of Mitsubishi’s next‑generation clean diesel family. It features an aluminum alloy block with cast‑iron liners, DOHC 16‑valve architecture, and a high‑pressure common‑rail fuel system with up to 2,700 bar injection pressure. In standard form it delivers 110–135 kW (150–184 PS), with torque figures between 350–400 Nm, offering strong low‑end response and refined performan…
Production years 2019–present meet Euro 6d standards depending on market (JAMA Type Approval #JAMA/EMS/5872).
The Mitsubishi 4N18 is a 2,268 cc inline‑four turbo‑diesel engineered for mid‑size SUVs and pickups (2019–present). It combines DOHC 16‑valve architecture with ultra‑high-pressure common‑rail injection to deliver strong low‑rpm torque and compliance with Euro 6d emissions. Designed for off‑road durability and towing, it balances performance with environmental responsibility.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,268 cc | |
Fuel type | Diesel (Ultra‑low sulfur) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 98.0 mm | |
Power output | 110–135 kW (150–184 PS) | |
Torque | 350–400 Nm @ 1,500–3,000 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,700 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (MHI TD05HV) | |
Timing system | Chain (front‑mounted; maintenance‑free design) | |
Oil type | Mitsubishi DiaQueen Diesel 0W‑30 (API CK‑4/ACEA C6) | |
Dry weight | 185 kg |
The Mitsubishi 4N18 was used across Mitsubishi's KH/KJ platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced sumps in the L200 KL and revised AdBlue tank routing in the Pajero Sport KJ—and from 2022 the facelifted Triton KL models adopted updated NOx sensor shielding, creating minor ECU calibration limits. All adaptations are documented in OEM technical bulletins.
The 4N18's primary reliability risk is AdBlue system faults in high‑dust or high‑humidity environments, with elevated incidence in off‑road or tropical use. Mitsubishi internal quality reports from 2022 indicated that vehicles operating in desert or monsoon climates showed increased DTCs related to urea dosing and NOx sensing, while EU service records show minor CP4.2 fuel pump wear as a secondary concern in examples using non‑EN 590 diesel. Extended oil change intervals and poor-quality AdBlue exacerbate aftertreatment failures, making correct fluid specification and environmental awareness critical.
Analysis derived from Mitsubishi technical bulletins (2021–2024) and EU national vehicle inspection failure statistics (2022–2024). 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 4N18 is robust for off-road and towing but requires strict adherence to fluid specifications. AdBlue and fuel quality are critical—use only ISO 22241 AdBlue and EN 590 diesel. With proper maintenance and 0W‑30 CK‑4 oil changes every 15,000 km, it can exceed 300,000 km without major issues.
Top issues include AdBlue dosing faults, NOx sensor degradation in dusty climates, CP4.2 fuel pump wear from poor diesel quality, and DPF regeneration failures from short-trip driving. All are documented in Mitsubishi service bulletins and manageable with OEM parts and correct fluids.
The 2.3 L 4N18 powers the Pajero Sport/Challenger (2019–present) and L200/Triton (2019–present) globally. It is used in mid- and high-trim variants across Asia, Oceania, Europe, and Latin America, always in longitudinal RWD/4WD layouts. No cross-manufacturer licensing has occurred.
Modest gains are possible. ECU remaps yield +15–25 kW safely by optimizing injection timing and boost. Bolt-ons (exhaust, intercooler) support stage 1 tuning. Significant tuning requires upgraded turbo and DPF delete (illegal in most markets). Most owners prioritize reliability over power.
Efficient for its torque output. In a Pajero Sport, expect ~9.8 L/100km (city) and ~7.2 L/100km (highway), or about 32 mpg UK combined. Real-world mixed driving typically returns 28–34 mpg (UK), depending on load, terrain, and AdBlue/DPF system health.
Yes. The 4N18 is an interference design. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain is durable—no widespread failures are documented if maintained properly.
Mitsubishi specifies 0W‑30 synthetic meeting API CK‑4 and ACEA C6 (e.g., DiaQueen Diesel). Change every 15,000 km or 12 months. Correct oil is vital for CP4.2 pump lubrication, turbo longevity, and DPF ash control.
Comprehensive technical documentation and regulatory references
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MITSUBISHI Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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