The Hyundai G4KJ is a 1,591 cc, inline‑four naturally aspirated petrol engine produced between 2015 and 2021. It features double overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 94–95 kW (128–129 PS) with torque between 156–157 Nm, offering responsive urban performance and smooth highway cruising.
Fitted to models such as the i20 (PB), i30 (FD/HD), and Venue (SU2), the G4KJ was engineered for fuel efficien…
Hyundai
All production years (2015–2021) meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/9215).
The Hyundai G4KJ is a 1,591 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and SUVs (2015–2021). It combines DOHC architecture with sequential multi‑point fuel injection to deliver linear power delivery and urban efficiency. Designed to meet Euro 6 emissions standards, it balances everyday drivability with low environmental impact.
| 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 | 94–95 kW (128–129 PS) @ 6,200 rpm | |
Torque | 156–157 Nm @ 4,500 rpm | |
Fuel system | Sequential multi‑point fuel injection (MPFI) | |
Emissions standard | Euro 6 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (maintenance‑free design) | |
Oil type | Hyundai SP 5W‑30 (API SN/ILSAC GF‑5) | |
Dry weight | 108 kg |
The Hyundai G4KJ was used across Hyundai's PB/FD/HD/SU2 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Venue SU2 and updated intake manifolds in the i30 HD—and from mid‑2017 the facelifted i20 PB adopted updated camshafts per TSB‑ENG‑112, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The G4KJ's primary reliability risk is exhaust camshaft lobe wear on early builds (pre-06/2017), with elevated incidence in high-RPM or stop-start urban use. Hyundai internal quality data from 2018 indicated a measurable rate of cam wear in engines exceeding 100,000 km without strict oil maintenance, while UK DVSA MOT records show low failure rates overall due to robust emissions hardware. Extended oil intervals and infrequent warm-up cycles increase lobe stress, making oil quality and change frequency critical.
Analysis derived from Hyundai technical bulletins (2016–2021) and UK DVSA failure statistics (2018–2023). 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 G4KJ is generally reliable with proper maintenance. Early models (2015–mid-2017) had exhaust camshaft wear issues, addressed from mid-2017 onward. Regular oil changes with correct 5W‑30 spec and timely ignition coil replacement ensure longevity beyond 200,000 km.
Top issues include exhaust cam lobe wear (pre-mid-2017), ignition coil failures, throttle body carbon buildup, and plastic thermostat housing leaks. These are documented in Hyundai TSB‑ENG‑112 and service manuals, with clear OEM repair paths.
The G4KJ powered the i20 (2015–2021), i30 (2015–2020), and Venue (2019–2021) across European and global markets. All applications are 1.6L petrol variants meeting Euro 6 emissions standards.
Limited tuning potential. The naturally aspirated design and conservative compression ratio allow modest gains (~5–7 kW) via ECU remap and intake/exhaust upgrades. Significant power increases require forced induction, which is unsupported by OEM and risks engine durability.
Efficient for its class. In an i20 1.6, expect ~6.8 L/100km (city) and ~4.9 L/100km (highway), or about 46 mpg UK combined. Real-world mixed driving typically yields 42–48 mpg (UK) depending on condition and driving style.
Yes. The G4KJ is an interference engine. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the chain is designed as maintenance-free and rarely fails if oil is maintained.
Hyundai specifies 5W‑30 synthetic or semi-synthetic oil meeting Hyundai SP (API SN/ILSAC GF‑5) standards. Change every 10,000 km or 12 months. Using incorrect oil accelerates cam wear, especially in early engines.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with HYUNDAI or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
HYUNDAI 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
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialHYUNDAI documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.