Denso 3479 Spark Plug

Denso Iridium Long Life Spark Plug 3479

Denso Iridium Long Life spark plug 3479 is built for OE-level ignition performance, durability, and emissions control. It is a direct-fit spark plug for select Hyundai and Kia applications, including Hyundai Accent, Sonata, Veloster, Tucson, Elantra, Genesis, Santa Fe Sport, and Kia Rio, Soul, Sportage, Optima, Forte Koup, and Forte5.

The Iridium Long Life line focuses on stable ignition performance over extended service intervals. This plug uses an iridium center electrode, a platinum chip ground electrode tip design, and a copper core center electrode to support consistent spark delivery in modern Hyundai and Kia engines.

Key Features

• Part number 3479 from Denso Iridium Long Life
• Iridium center electrode tip material for durable spark performance
• Platinum chip ground electrode tip design
• Copper core center electrode and nickel ground electrode core
• 5000 resistance specification
• Flat seat design with 12.00 mm thread diameter
• 16.0 mm hex size and 26.50 mm reach
• Pre-gapped to 0.8 mm
• OE-style construction for select Hyundai and Kia engines

Product Details

Denso 3479 is engineered to meet strict OE performance, durability, and emissions standards. The iridium center electrode helps maintain consistent ignition characteristics, while the platinum chip ground electrode tip supports long service life in demanding daily-driving conditions. This spark plug is a strong match for drivers searching for a Hyundai Accent spark plug, Kia Rio iridium spark plug, or OE replacement spark plug for Hyundai Sonata and Kia Soul applications. This part cross-references Denso Auto Parts ZXU20HCR8 for the same application.

Compatible With select 2009-2020 Hyundai and Kia vehicles, including Fits 2017-2020 Hyundai Accent, N/A; Fits 2017-2019 Kia Rio, N/A; Fits 2016-2017 Hyundai Tucson, N/A; Fits 2017 Hyundai Veloster, N/A; Fits 2012-2016 Hyundai Accent, N/A; Fits 2015-2016 Hyundai Sonata, N/A; Fits 2011-2013 Hyundai Sonata, N/A; Fits 2012-2016 Hyundai Veloster, N/A; Fits 2014-2016 Kia Forte Koup, N/A; Fits 2015-2016 Kia Forte5, N/A; Fits 2016 Kia Optima, N/A; Fits 2011-2013 Kia Optima, N/A; Fits 2012-2016 Kia Rio, N/A; Fits 2012-2016 Kia Soul, N/A; Fits 2013 Hyundai Santa Fe Sport, N/A; Fits 2012-2013 Kia Soul, N/A; Fits 2011-2013 Kia Sportage, N/A; Fits 2011 Hyundai Elantra, N/A; Fits 2009 Hyundai Genesis, N/A.

Common Issues This Part Can Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire symptoms related to plug wear or gap growth
• Reduced fuel economy from degraded spark performance
• Emissions-related drivability concerns tied to aging plugs

Installation Notes and Tips

Verify engine application, thread diameter, reach, seat type, and heat range before installation. The pre-gap size is 0.8 mm, but always confirm the gap against the vehicle service specification before use. Inspect ignition coils and plug wells for wear, oil, or contamination during service, and follow the manufacturer’s torque procedure for the engine.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards. The Iridium Long Life design is intended for consistent ignition quality in the listed Hyundai and Kia applications, with construction details selected to support long-term service in modern secondary ignition systems.