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 e…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The G4NA-02 is generally reliable, especially post-2019 models with updated intake manifolds. Early engines (2016–2019) may develop intake runner faults, but with proper maintenance—regular oil changes using 5W-30 and timely manifold updates if needed—the engine can exceed 200,000 km without major issues.
The main issues are intake manifold runner flap failure in early builds, CVVT actuator faults due to oil sludge, valve cover gasket leaks, and throttle body carbon buildup. These are documented in Hyundai service bulletins and are manageable with OEM-recommended maintenance.
The G4NA-02 1.6 L petrol engine was used in the i30 (PD, 2016–2020), Kona (OS, 2017–2023), and Kia Ceed (JD, 2018–2023). All are Euro 6b-compliant and feature Dual CVVT with multi-point injection—distinguishing them from direct-injection Gamma engines.
Modest gains are possible via ECU remapping (+5–8 kW), but the engine lacks forced induction and uses MPFI, limiting potential. Bolt-on upgrades yield minimal returns. Significant tuning is uncommon due to the engine’s design focus on efficiency over performance.
In a 2018 i30 1.6 MPi, expect ~7.0 L/100km (city), ~5.0 L/100km (highway), or ~42 mpg UK combined. Real-world mixed driving typically yields 39–45 mpg UK, depending on conditions and maintenance.
Yes. The G4NA-02 is an interference engine. If the timing chain fails (rare but possible under severe oil starvation), piston-to-valve contact can cause catastrophic damage. Maintaining oil quality and level is essential.
Hyundai specifies 5W-30 synthetic oil meeting API SN or ILSAC GF-5 standards. Genuine Hyundai oil is recommended. Change every 10,000 km or 12 months to protect CVVT operation and timing components.
Comprehensive technical documentation and regulatory references
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