The Mitsubishi 4N14 is a 2,268 cc, inline‑four turbo‑diesel engine produced between 2010 and 2023. It features an aluminum block with cast‑iron liners, DOHC 16‑valve architecture, and a variable geometry turbocharger (VGT). In standard form it delivered 110–135 kW (150–184 PS) and 360–380 Nm of torque, with strong low‑end pull and refined operation suited for SUVs and crossovers.
Fitted to models such as the ASX (GA), Outlander (GE/GG), and Eclipse Cross (GN), the 4N14…
Production years 2010–2014 meet Euro 5 standards; 2015–2023 models meet Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/3125).
The Mitsubishi 4N14 is a 2,268 cc inline‑four turbo‑diesel engineered for compact and mid-size SUVs (2010–2023). It combines DOHC 16-valve architecture with high-pressure common-rail injection and a variable geometry turbocharger to deliver responsive torque and smooth operation. Designed to meet Euro 5 and Euro 6 emissions standards, it balances urban efficiency with highway refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,268 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 97.4 mm | |
Power output | 110–135 kW (150–184 PS) @ 3,500–4,000 rpm | |
Torque | 360–380 Nm @ 1,500–2,500 rpm | |
Fuel system | Denso common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 5 (2010–2014); Euro 6 (2015–2023) | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Variable geometry turbo (VGT, Mitsubishi TD04-based) | |
Timing system | Chain (maintenance‑free design) | |
Oil type | API CJ-4/CK-4, ACEA C3, SAE 5W‑30 | |
Dry weight | 158 kg |
The Mitsubishi 4N14 was used across Mitsubishi's Global SUV platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Outlander and revised intake manifolds in the Eclipse Cross—and from 2015 the ASX received updated ECU calibration for Euro 6 compliance, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The 4N14's primary reliability risk is diesel particulate filter (DPF) saturation due to insufficient regeneration in short-trip urban use. Mitsubishi internal data from 2016 indicated up to 12% of early Euro 5 units required forced regeneration or DPF replacement before 100,000 km, while UK DVSA MOT records show increased emissions failures linked to DPF inefficiency. Extended idling and infrequent highway driving accelerate soot accumulation, making driving pattern and ECU logic critical.
Analysis derived from Mitsubishi technical bulletins (2012–2018) and UK DVSA failure statistics (2015–2023). 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 4N14 offers refined performance and strong torque but requires attentive maintenance. Early Euro 5 units (2010–2014) are prone to DPF issues in urban use, while post-2015 Euro 6 models feature improved regeneration logic. With regular oil changes (every 15,000 km), quality ULSD fuel, and occasional highway driving, many examples exceed 250,000 km without major issues.
Top issues include DPF regeneration failure (short-trip driving), EGR cooler leakage, high-pressure fuel pump wear, and VGT actuator sticking. All are documented in Mitsubishi TSBs and can be mitigated with proper fuel, driving habits, and timely software updates.
The 4N14 appears in the ASX (2010–2023), Outlander (2012–2021), Eclipse Cross (2017–2023), and limited Pajero Sport variants (2015–2019). It was developed in-house and not licensed to other manufacturers.
Modest gains are possible. ECU remaps typically yield +15–25 kW by optimizing boost and injection timing. However, DPF and EGR constraints limit tuning potential. Most owners focus on drivability improvements rather than significant power increases due to emissions system complexity.
Excellent for an SUV diesel. In an Outlander 2.2 DI-D, expect ~6.2 L/100km (city) and ~4.8 L/100km (highway), or about 52 mpg UK combined. Real-world mixed driving typically returns 48–55 mpg (UK) with conservative driving and regular DPF regeneration.
Yes. The 4N14 is an interference engine. If the timing chain were to fail (extremely rare due to robust design), piston-to-valve contact would cause severe internal damage. However, the chain is designed to last the engine’s lifetime with proper oil maintenance.
Mitsubishi specifies SAE 5W‑30 oil meeting ACEA C3 (or API CJ-4/CK-4). Always use a quality low-SAPS synthetic blend and change every 15,000 km to protect the DPF, turbo, and chain-driven valvetrain.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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