The Kia G4K2 is a 1,497 cc, inline‑four turbocharged petrol engine produced from 2021 onwards. It features dual overhead camshafts (DOHC), 16 valves, and Kia's Smartstream technology with Continuously Variable Valve Duration (CVVD) for optimized performance and efficiency. In standard form it delivers 147 kW (200 PS) and 253 Nm of torque, engineered for compact SUVs seeking a blend of spirited performance and fuel economy.
Fitted primarily to the second-generation Kia Seltos and the third-generation Kia Sportage, the G4K2 engine was designed for responsive acceleration and confident highway overtaking. Its character prioritizes broad torque delivery from low RPMs, supported by a twin-scroll turbocharger. Emissions compliance is achieved through gasoline particulate filter (GPF) and precise direct injection, meeting Euro 6d standards.
One documented engineering update addressed potential high-pressure fuel pump (HPFP) noise under specific cold-start conditions, as noted in Kia Technical Service Bulletin TSB-22-FL-008. This was linked to initial pump calibration interacting with low ambient temperatures. Kia implemented revised ECU software for engines produced after August 2022 to mitigate this audible concern.
Production years 2021–Present meet Euro 6d standards across all applicable markets (VCA UK Type Approval #VCA/KIA/G4K2/2021).
The Kia G4K2 is a 1,497 cc inline‑four turbocharged petrol engineered for compact and midsize SUVs (2021-Present). It combines Smartstream G technology with CVVD and gasoline direct injection to deliver strong, broad torque and class-leading efficiency. Designed to meet Euro 6d standards, it balances dynamic performance with low running costs.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,497 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 74.0 mm × 87.0 mm | |
| Power output | 147 kW (200 PS) @ 6,000 rpm | |
| Torque | 253 Nm @ 1,500–4,000 rpm | |
| Fuel system | Gasoline Direct Injection (GDI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin-scroll turbocharger | |
| Timing system | Chain-driven | |
| Oil type | ACEA C5 or API SP (SAE 0W‑20) | |
| Dry weight | 110 kg |
The twin-scroll turbo and CVVD system provide strong, linear power ideal for dynamic driving but require strict adherence to 15,000 km oil change intervals using the specified 0W-20 low-viscosity oil to protect the turbo and GPF. Ultra-low sulfur petrol (ULSP) meeting EN 228 is mandatory to prevent injector fouling and GPF clogging. Early production engines (pre-08/2022) may benefit from ECU update per TSB-22-FL-008 if high-pressure fuel pump noise is observed during cold starts. The timing chain is designed for life-of-engine service.
Oil Specs: Requires ACEA C5 or API SP (0W-20) low-viscosity, low-SAPS oil to protect GPF and ensure CVVD operation (Kia Owner's Manual).
Emissions: Euro 6d certification applies to all 2021-Present G4K2 engines (VCA Type Approval #VCA/KIA/G4K2/2021).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model applications (Kia TIS Doc. KTS-G4K2-03).
Kia Technical Information System (TIS): Docs KTS-G4K2-01, KTS-G4K2-02, KTS-G4K2-03
Kia Technical Service Bulletin: TSB-22-FL-008
VCA Type Approval Database (VCA/KIA/G4K2/2021)
The Kia G4K2 was used across Kia's NQ5 and NQ platforms with transverse mounting. This engine received platform-specific adaptations-optimized engine mounts for the Sportage SUV-and no significant facelift revisions have occurred, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat machined surface on the front of the cylinder block, near the exhaust manifold (Kia TIS KTS-G4K2-01). The 8th digit of the VIN for Seltos NQ5 models is 'K' for the G4K2 engine. Visually, it can be identified by its compact size, silver plastic intake manifold, and the presence of a twin-scroll turbocharger. Critical differentiation from the naturally aspirated G4LC: The G4K2 has a turbocharger, intercooler, and associated piping. Engine mounts and some ancillary brackets are shared within the Smartstream G family, but the long block and turbo system are unique.
The G4K2's primary documented concern is potential high-pressure fuel pump noise in early builds under cold conditions, linked to specific calibration. Kia internal data indicated this was an isolated noise issue with no impact on durability, while UK DVSA records show no systemic emissions or mechanical failure trends. Infrequent oil changes can exacerbate GPF clogging, making adherence to the specified 0W-20 oil and service intervals critical.
Analysis derived from Kia technical bulletins (2021-Present) and UK DVSA failure statistics (2022-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4K2.
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