NGK 4904 Spark Plug

NGK Laser Iridium Spark Plug for Toyota and Lexus

NGK Laser Iridium Spark Plug 4904 is an OE-style ignition component built for select Toyota and Lexus V8 applications. It uses an iridium center electrode, nickel ground electrode, and a 0.044 in pre-gap to support consistent spark delivery in engines that call for long service intervals.

Compatible With Toyota Tundra, Tacoma, Sequoia, 4Runner, FJ Cruiser, Land Cruiser, and Lexus GX460 and LX570 applications listed below, this NGK spark plug is specified for factory-recommended service intervals on many late-model trucks and SUVs. Part number 4904 is also identified as ILFR6T11.

Key Features

• Laser Iridium spark plug with iridium center electrode tip
• Nickel ground electrode with standard tip and standard configuration
• 0.044 in pre-gap for listed Toyota and Lexus applications
• 14 mm thread diameter, 5/8 in hex, flat seat design
• 5000 ohm resistance and non-removable nut terminal
• OE-equivalent design for factory-style ignition service
• Part number 4904 / ILFR6T11

Product Details

NGK builds this Laser Iridium spark plug to match the ignition requirements of select Toyota and Lexus engines, including the Toyota Tundra, Tacoma, Sequoia, 4Runner, FJ Cruiser, and Land Cruiser, plus Lexus GX460 and LX570 coverage. The iridium center electrode supports precise spark delivery, while the copper core and nickel ground electrode help maintain stable operation under normal engine conditions. With a manufacturer heat range of 6 and OE-equivalent dimensions, this plug is suited for vehicles calling for long maintenance intervals and factory-style fitment.

NGK is a major OE spark plug supplier in North America with decades of automotive manufacturing experience. Part number 4904 is listed across multiple interchange references for the same application family.

This part cross-references DENSO Auto Parts 4704 and Bosch 6731 for the same application.

Common Uses

• Restoring weak or inconsistent ignition performance
• Addressing misfire codes related to worn spark plugs
• Replacing plugs at factory-recommended service intervals
• Improving cold-start and idle consistency on listed Toyota and Lexus models
• Maintaining proper combustion in high-mileage V8 engines

Installation Notes and Tips

• Verify engine application before installation using the vehicle’s service information.
• Check the gap specification for the exact model year; several applications require 0.044 in.
• Use proper torque procedures for the flat-seat design to avoid thread or sealing damage.
• Inspect ignition coils, boots, and wiring during spark plug service.
• Follow the vehicle manufacturer’s service interval guidance for the listed Toyota and Lexus applications.

Quality Assurance

NGK manufactures this spark plug to OE standards and supplies ignition components for domestic and import vehicles across North America. Part number 4904 is built for durability and consistent operational performance in the applications listed above.