Denso 5354 Spark Plug

Denso Iridium Power Spark Plug 5354

Denso Iridium Power 5354 is a performance spark plug built for precise ignition response and stable combustion. It uses a 0.4 mm iridium center electrode, a tapered cut ground tip, and a U-groove design to support efficient spark delivery in select Hyundai, Kia, and Mitsubishi applications.

The Iridium Power line focuses on compact electrode design and durable materials for drivers who want a direct-fit ignition upgrade. This plug is a strong match for vehicles such as the Hyundai Accent, Hyundai Veloster, Kia Rio, and Kia Soul when the listed fitment matches the engine application.

Key Features

• Part number 5354 from Denso Iridium Power
• 0.4 mm iridium center electrode for fine-tip ignition performance
• Tapercut ground electrode with U-groove design
• Nickel ground electrode core and copper center electrode core
• 0.9 pre-gap size for OE-style setup
• 12.0 mm thread diameter, 26.50 reach, and flat seat design
• 5000 resistance specification
• 16.0 hex size for standard service-tool access

Product Details

Denso 5354 is an iridium spark plug engineered for secondary ignition systems that require a compact electrode profile and stable electrical characteristics. The iridium tip helps maintain a fine firing point, while the tapered cut and U-groove ground design support consistent spark exposure. With a flat seat, 12.0 mm thread diameter, and 26.50 reach, this plug is built for the listed Hyundai, Kia, and Mitsubishi fitments, including 2015-2021 Hyundai Accent, 2015-2019 Kia Rio, and 2012-2015 Kia Soul. This part cross-references DENSO Auto Parts IXUH20I for the same application.

Common Reasons to Replace

• Engine misfire or rough idle
• Hard starting or extended crank time
• Reduced throttle response
• Fuel economy decline from worn ignition components
• Service interval replacement on listed Hyundai Accent, Kia Rio, or Kia Soul applications

Installation Notes

Verify the engine code and OE cross-reference before installation. Confirm the 0.9 pre-gap specification against the vehicle requirement and inspect coil boots, plug wells, and threads before service. Use the correct torque procedure for the aluminum cylinder head and avoid over-tightening. This plug is listed for multiple model years, including 2011-2013 Hyundai Sonata, 2011-2013 Kia Optima, and 2011-2013 Kia Sportage, so match the exact application before ordering.

Quality Assurance

Denso manufactures the Iridium Power line with a fine-wire iridium center electrode and application-specific construction for ignition consistency. Part number 5354 is cataloged for direct-fit use in the vehicles shown in the fitment data, including Hyundai Accent, Hyundai Veloster, and Kia Rio applications.