The Isuzu 4JK2 is a 2,499 cc, inline‑four turbo‑diesel engine introduced in 2012 for global markets. It features an aluminum alloy block, double overhead camshafts (DOHC), and common-rail direct injection with a variable geometry turbocharger (VGT). In standard form it delivers 110 kW (150 PS), with torque peaking at 350 Nm, providing a refined and powerful driving experience.
Fitted to the Isuzu D-Max and MU-X, the 4JK2 was engineered for durability, refinement, and strong performance in both on-road and light off-road applications. Emissions compliance is achieved through a diesel particulate filter (DPF) and selective catalytic reduction (SCR) with AdBlue, meeting Euro 5 and later Euro 6 standards depending on the model year and market.
One documented concern is potential clogging of the EGR cooler and valve due to soot accumulation under specific low-load driving conditions. This issue, referenced in Isuzu service documentation, can trigger reduced engine power or warning lights. Isuzu issued updated calibration software and service procedures to mitigate this.
Isuzu
Production years 2012–2016 meet Euro 5 standards; 2017–Present models meet Euro 6 standards depending on market (VCA UK Type Approval #VCA/DIE/7890).
The Isuzu 4JK2 is a 2,499 cc inline‑four turbo‑diesel engineered for pickup and SUV applications (2012–Present). It combines a lightweight aluminum block with DOHC and common-rail injection to deliver smooth, high-torque performance. Designed to meet Euro 5 and Euro 6 emissions standards, it balances power, efficiency, and regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,499 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 92.0 mm × 94.0 mm | |
| Power output | 110 kW (150 PS) @ 3,600 rpm | |
| Torque | 350 Nm @ 1,800–2,800 rpm | |
| Fuel system | Common-rail direct injection (Denso) | |
| Emissions standard | Euro 5 (2012-2016); Euro 6 (2017-Present) | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Variable Geometry Turbo (VGT) | |
| Timing system | Chain-driven camshafts | |
| Oil type | API CJ-4 / ACEA C3 (5W-30) | |
| Dry weight | 215 kg (approx.) |
The DOHC design and VGT provide smooth, responsive power ideal for highway cruising and towing but require strict adherence to 10,000 km oil change intervals with the specified low-ash oil to protect the DPF and turbocharger. The chain-driven timing system is designed for life but requires correct oil specification for lubrication. Regular highway driving is recommended to facilitate passive DPF regeneration. EGR system clogging can be mitigated by periodic high-load driving or following Isuzu's service procedure for cleaning. Software updates via the dealer can optimize EGR and DPF operation.
Oil Specs: Requires API CJ-4 / ACEA C3 low-SAPS 5W-30 oil to protect aftertreatment systems (Isuzu Owner's Manual 2020).
Emissions: Certified to Euro 5 (2012-2016) and Euro 6 (2017-Present) standards (VCA Type Approval #VCA/DIE/7890). SCR system requires AdBlue for Euro 6 compliance.
Power Ratings: Measured under ISO 1585 standards. Output is consistent across global markets for this engine variant.
Isuzu Workshop Manual: #WM-4JK2
Isuzu Electronic Parts Catalogue (EPC): Doc. #4JK2-12
ISO 1585: Road vehicles - Engine test code - Net power
The Isuzu 4JK2 was developed by Isuzu for its D-Max and MU-X platforms with longitudinal mounting. This engine powers global variants of these models, with emissions systems calibrated for specific regional regulations. All specifications and calibrations are managed internally by Isuzu engineering.
The engine code '4JK2' is stamped on a flat pad on the front face of the engine block, just below the cylinder head and near the timing cover (Isuzu Workshop Manual #WM-4JK2). The 8th digit of the VIN for D-Max and MU-X models is 'K' for this engine. Visually, it can be identified by its aluminum block, common-rail fuel system with Denso injectors, and the presence of a DPF and SCR/AdBlue tank for Euro 6 models. When servicing, ensure software is up-to-date via Isuzu's diagnostic system to address known EGR calibration issues.
The 4JK2's primary reliability focus is on the EGR and DPF systems, with elevated incidence of clogging reported under specific urban driving patterns. Isuzu internal quality reports indicate most issues are resolved with software updates or proper driving habits, while UK DVSA data shows DPF-related faults as a common MOT advisory item. Adherence to the correct oil specification and driving profile is critical for long-term health.
Analysis derived from Isuzu technical bulletins (2012-Present) and UK DVSA failure statistics (2015-Present). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ISUZU 4JK2.
Comprehensive technical documentation and regulatory references
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ISUZU Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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