The Kia D4HA is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2015 and 2020. It features a high-pressure common-rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). This engine was designed to offer a balance of performance and efficiency, with outputs ranging from 110 kW (150 PS) to 136 kW (185 PS) and torque figures between 380–440 Nm.
Fitted to models such as the Sportage (QL), Sorento (UM), and Optima (JF), the D4HA was engineered for drivers seeking responsive performance and strong towing capability. Emissions compliance was achieved through a diesel particulate filter (DPF) and selective catalytic reduction (SCR) with AdBlue, allowing it to meet stringent Euro 6 standards across its production run.
One documented reliability concern involves the high-pressure fuel pump, which can experience premature wear leading to hard starting or loss of power. This issue, referenced in Kia Technical Service Bulletin TSB-17-DIE-003, is often linked to fuel contamination or extended service intervals. Kia later revised the pump design and updated maintenance schedules to mitigate the problem.
All production years 2015–2020 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/5678).
The Kia D4HA is a 1,995 cc inline‑four turbo‑diesel engineered for SUV and mid‑size sedan applications (2015-2020). It combines common‑rail direct injection with a variable‑geometry turbocharger to deliver strong mid‑range torque and efficient highway cruising. Designed to meet Euro 6 standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 83.0 mm × 92.0 mm | |
| Power output | 110–136 kW (150–185 PS) | |
| Torque | 380–440 Nm @ 1,750–2,750 rpm | |
| Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (Honeywell) | |
| Timing system | Chain-driven | |
| Oil type | ACEA C2/C3 (SAE 5W‑30) | |
| Dry weight | 165 kg |
The VGT turbo provides strong, linear torque ideal for overtaking and towing but demands strict adherence to 15,000 km or annual oil change intervals to protect the turbo and timing chain. ACEA C2/C3 (5W-30) low-ash oil is critical to prevent DPF clogging and ensure SCR system longevity. The Bosch CP4.2 fuel pump is sensitive to fuel quality; only ultra-low-sulfur diesel (EN 590) should be used to prevent internal wear and costly failure. Vehicles used for frequent short trips may require more frequent DPF regeneration cycles. AdBlue tank refills are mandatory for emissions compliance and normal operation.
Oil Specs: Requires ACEA C2/C3 specification oil (Kia Owner's Manual OM-D4HA-2016).
Emissions: Euro 6 certification applies to all 2015–2020 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Peak output requires optimal AdBlue system function (Kia TSB 18-EMS-001).
Kia Technical Information System: Workshop Manual WM-D4HA-01, TSB 17-DIE-003
VCA Type Approval Database (VCA/EMS/5678)
ACEA European Oil Sequences: C2/C3 Specifications
The Kia D4HA was used across Kia's QL/UM/JF platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Sorento for towing and revised intake manifolds in the Optima-with no major facelift revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the timing cover (Kia Workshop Manual WM-D4HA-01). The 8th digit of the VIN typically corresponds to the engine code ('H' for D4HA). Visually, the engine is identifiable by its black plastic valve cover and the AdBlue injector mounted on the exhaust manifold. Critical differentiation from the D4CB: The D4HA uses a CP4.2 high-pressure pump and SCR/AdBlue system, while the D4CB uses a CP3 pump and EGR-only emissions control. Service parts, particularly for the fuel and emissions systems, are not interchangeable.
The D4HA's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel or exceeding service intervals. Kia TSB 17-DIE-003 notes a significant number of pump failures before 100,000 km under these conditions, while DVSA data indicates AdBlue system faults are a common cause of warning lights. Neglecting oil changes and using incorrect fuel make preventative maintenance critical.
Analysis derived from Kia technical bulletins (2015-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA D4HA-TURBO.
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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