Denso 5394 Spark Plug

Denso Iridium Power Spark Plug 5394

Denso Iridium Power 5394 is a performance spark plug built for precise ignition response and stable combustion. It uses a 0.4 mm iridium center electrode, a copper core center electrode, and a nickel ground electrode to support consistent spark delivery in demanding ignition systems.

For drivers searching for a Denso spark plug for Honda Civic or Toyota Corolla service, this Iridium Power design focuses on efficient ignition with a fine-wire iridium tip and a tapered, U-groove ground electrode profile. The 5394 part number is also referenced as DENSO Auto Parts IXG24.

Key Features

• Iridium center electrode tip with a 0.4 mm fine-wire design
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with tapercut and U-groove tip design
• 5000 ohm resistance for ignition system compatibility
• Pre-gapped to 0.7 mm
• Flat seat, 12.0 mm thread diameter, 22.0 mm reach, and 18.0 mm hex size
• Manufacturer heat range 24

Product Details

The Denso Iridium Power line is engineered around a fine iridium firing tip to reduce the voltage needed to initiate spark and maintain a focused ignition point. On applications such as Honda Civic and Toyota Corolla service, that can support cleaner combustion behavior and consistent throttle response when the ignition system is in proper condition. Part number 5394 is a direct reference point for buyers comparing Denso 5394 against IXG24 interchange listings.

This spark plug is built with a standard ground configuration, a single ground electrode, and a flat seat for applications that call for those specifications. The 5000 ohm resistor design helps control electrical noise in modern ignition systems, while the copper core and nickel ground materials support thermal management and durability.

What It Helps Address

• Misfire conditions caused by worn or eroded spark plug electrodes
• Hard starting related to weak spark delivery
• Rough idle from inconsistent ignition performance
• Reduced combustion efficiency from excessive plug wear
• Ignition noise control needs in resistor-equipped systems

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. This plug uses a 12.0 mm thread diameter, 22.0 mm reach, 18.0 mm hex size, and flat seat, so matching the engine specification is essential. Check and confirm the pre-gap against the vehicle service specification before use, and install with the correct torque procedure for the cylinder head material.

For fitment-based searches, use the exact vehicle application data for your Honda Civic, Toyota Corolla, or other listed model before ordering. Denso 5394 should be matched to the engine’s required plug style rather than selected by thread size alone.

Quality Assurance

Denso Iridium Power spark plugs are built to Denso’s ignition component standards and use an iridium fine-wire center electrode for precise spark control. The part number 5394 is supported by the Denso Auto Parts IXG24 cross-reference for the same application.