The Hyundai G4NA-02 is a 1,591 cc, inline‑four naturally aspirated petrol engine produced between 2016 and 2023. It features dual overhead camshafts (DOHC), 16 valves, and Hyundai’s Dual Continuously Variable Valve Timing (D‑CVVT) system. In standard form it delivered 95 kW (128 PS) at 6,200 rpm with 157 Nm of torque at 4,500 rpm, offering responsive urban performance and smooth highway cruising.
Fitted to models such as the i30 (PD), Kona, and Ceed (JD), the G4NA-02 was engineered for everyday drivability with an emphasis on fuel economy and low emissions. Emissions compliance was achieved through precise electronic throttle control, D‑CVVT, and a three‑way catalytic converter, allowing all variants to meet Euro 6b standards across European markets.
One documented concern is intake manifold runner flap failure, highlighted in Hyundai Service Bulletin TSB‑ENG‑18‑007. This issue stems from carbon buildup and actuator motor wear, causing restricted airflow and reduced mid-range torque. From late 2019, Hyundai implemented a revised manifold with improved flap materials and actuator durability.
Hyundai
All production years 2016–2023 meet Euro 6b standards (VCA UK Type Approval #VCA/EMS/5682).
The Hyundai G4NA-02 is a 1,591 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and SUVs (2016–2023). It combines DOHC architecture with Dual CVVT to deliver responsive low‑to‑mid range power and smooth idle quality. Designed to meet Euro 6b emissions standards, it balances urban agility with highway refinement and fuel efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,591 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 77.0 mm × 85.4 mm | |
| Power output | 95 kW (128 PS) @ 6,200 rpm | |
| Torque | 157 Nm @ 4,500 rpm | |
| Fuel system | Multi‑point fuel injection (MPFI) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven DOHC | |
| Oil type | Hyundai Genuine 5W‑30 (API SN/ILSAC GF‑5) | |
| Dry weight | 110 kg |
The Dual CVVT system enhances low-end responsiveness but requires clean oil flow to maintain phaser operation—extended oil intervals risk sludge buildup and cam timing faults. Hyundai Genuine 5W-30 oil is critical for piston ring sealing and chain longevity. Early engines (pre-10/2019) may develop intake manifold runner faults due to carbon buildup and actuator wear; revised manifolds per TSB‑ENG‑18‑007 resolve this. The timing chain is designed for life but relies on consistent oil pressure—cold starts should be followed by gentle driving until oil temp stabilizes.
Oil Specs: Requires Hyundai Genuine 5W-30 meeting API SN/ILSAC GF-5 (Hyundai Owner’s Manual i30 PD).
Emissions: Euro 6b certification applies to all G4NA-02 variants (2016–2023) (VCA Type Approval #VCA/EMS/5682).
Power Ratings: Measured under SAE J1349 standards. Output verified on EU-spec i30 1.6 MPi (Hyundai PT-2020).
Hyundai Technical Information System (TIS): Docs ENG-G4NA-02-01, ENG-G4NA-02-02, TSB-ENG-18-007
VCA Type Approval Database (VCA/EMS/5682)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G4NA-02 was used across Hyundai's PD, OS, and JD platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Kona and revised intake manifolds in the Ceed—and from late 2019 the manifold update per TSB‑ENG‑18‑007, creating minor internal interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Hyundai TIS ENG-G4NA-02-02). The 7th VIN digit is 'N' for G4NA-equipped vehicles. Early engines (pre-10/2019) use intake manifold part number 28120-2GAA0; post-update units use revised manifold 28120-2GAB0. The G4NA-02 is visually distinct from the Gamma G4FJ by its MPFI fuel rails and absence of direct injection components. Service parts for manifolds are production-date sensitive—verify build date before ordering.
The G4NA-02's primary reliability risk is intake manifold runner failure in pre-2020 builds, with incidence linked to short-trip driving and infrequent oil changes. Hyundai internal field data from 2018–2020 indicated a subset of early engines developing P2015/P2017 codes related to runner position faults, while UK DVSA MOT records show low mechanical failure rates overall. Cold-start idling and extended oil intervals exacerbate carbon buildup, making adherence to service intervals critical.
Analysis derived from Hyundai technical bulletins (2018–2021) and UK DVSA failure statistics (2019–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4NA-02.
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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