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 was engineered for global emissions compliance and everyday drivability. Emissions compliance was achieved through high-pressure common‑rail injection, cooled exhaust gas recirculation (EGR), and a diesel particulate filter (DPF), meeting Euro 5 and Euro 6 standards across markets.
One documented concern is diesel particulate filter (DPF) regeneration failure under frequent short‑trip driving, highlighted in Mitsubishi Technical Service Bulletin TSB-ENG-12-008. This issue was linked to insufficient exhaust temperature for passive regeneration and exacerbated by urban driving cycles. From 2015 onward, Mitsubishi introduced revised ECU logic and enhanced thermal management to improve regeneration reliability.
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 DOHC VGT design provides strong low-RPM torque ideal for urban and highway driving but requires strict adherence to 15,000 km oil change intervals using ACEA C3 5W‑30 oil to protect the chain-driven valvetrain and turbo bearings. The DPF system demands occasional sustained highway driving (≥60 km/h for 20+ minutes) to enable passive regeneration. Frequent short trips without regeneration lead to DPF saturation and limp mode. Post-2015 ECUs feature improved regeneration logic per TSB-ENG-12-008. Fuel must meet EN 590 ultra-low-sulfur diesel (ULSD) standards to prevent injector and DPF damage.
Oil Specs: Requires ACEA C3 (5W‑30) specification (Mitsubishi Owner’s Manual 2011). API CJ-4/CK-4 also acceptable.
Emissions: Euro 5 certification applies to 2010–2014 models; Euro 6 applies to 2015–2023 models (VCA Type Approval #VCA/EMS/3125).
Power Ratings: Measured under ISO 1585 standards. Output varies slightly by model calibration (Mitsubishi TIS Doc. ENG‑4N14‑A).
Mitsubishi Technical Information System (TIS): Docs ENG‑4N14‑A, ENG‑4N14‑B, TSB-ENG-12-008
VCA Type Approval Database (VCA/EMS/3125)
ISO 1585: Road vehicles — Engine test code
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.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Mitsubishi TIS ENG‑4N14‑A). The 7th VIN digit indicates engine family ('N' for 4N14 series). Early models (2010–2014) use silver valve covers with black timing covers; post-2015 units feature all-black covers. Critical differentiation from 4N13: 4N14 has 2,268 cc displacement and aluminum block, while 4N13 uses 1,798 cc and iron block. ECU part numbers must match model year—pre-2015 ECUs lack updated DPF regeneration logic per TSB-ENG-12-008.
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.
Find answers to most commonly asked questions about MITSUBISHI 4N14.
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