Denso 4704 Spark Plug

Denso Iridium TT Spark Plug 4704

Denso Iridium TT 4704 is an OE-style spark plug built for durability, stable ignition, and consistent power delivery. It combines a fine-wire iridium center electrode with a platinum twin-tip ground design to support strong spark performance and long service life.

Compatible With a wide range of applications, including Toyota Tacoma, Toyota Tundra, Honda Civic, Subaru WRX STI, and Lexus GX460 fitments listed below.

Key Features

• Iridium center electrode tip for precise ignition performance
• Platinum Twin-Tip ground electrode design for improved wear resistance
• OE-style construction for factory-type fit and function
• 5000 ohm resistance for ignition system compatibility
• Flat seat, 14.00 mm thread diameter, 26.50 mm reach, and 16.0 mm hex size
• Pre-gapped to 1.0 mm
• Cross-reference example: DENSO Auto Parts IKH20TT

Product Details

The Denso Iridium TT line focuses on combining OE-style durability with responsive ignition performance. Part number 4704 uses an iridium center electrode and a platinum twin-tip ground electrode to help maintain a consistent spark over time. That makes it a practical choice for drivers looking for factory-correct replacement performance on vehicles such as Toyota Tacoma, Toyota Tundra, Honda Civic, and Subaru WRX STI applications listed in the fitment data.

This spark plug is used in ignition service where worn plugs can contribute to rough idle, misfires, hard starting, reduced fuel economy, or hesitation under load. It also supports replacement needs on vehicles with long-reach, flat-seat plug specifications.

What It Helps Address

• Engine misfire caused by worn or fouled spark plugs
• Hard starting and inconsistent cold-start ignition
• Rough idle and uneven combustion
• Loss of throttle response or acceleration feel
• Reduced ignition efficiency from aged plug electrodes

Installation Notes and Fitment

Compatible With 2018-2022 Toyota Tacoma, 2018-2021 Toyota Tundra, 2011-2015 Honda Civic, 2013-2016 Subaru WRX STI, and 2010-2016 Lexus GX460 among many other listed applications. Fitment also includes 2021-2023 Ford F-150, 2021-2023 Ram 1500, 2015-2023 Dodge Challenger, and 2015-2022 Dodge Charger.

Verify engine code, plug seat type, thread reach, and gap specification before installation. Use the vehicle service manual for torque and removal procedures, and inspect ignition coils and boots during spark plug replacement.

Quality Assurance

Denso manufactures the Iridium TT line as an OE-style ignition component with materials selected for durability and stable performance. Part number 4704 is built to match the listed application requirements and support dependable secondary ignition service.