Denso 4705 Spark Plug

Denso Iridium TT Spark Plug 4705

Denso Iridium TT 4705 is an OE-style spark plug built for steady ignition performance, durability, and responsive power delivery. It combines an iridium center electrode with a platinum twin-tip ground design to support consistent spark quality in demanding Toyota and Lexus applications.

Key Features

• Iridium center electrode tip for precise ignition performance
• Platinum Twin-Tip ground electrode design for stable spark exposure
• OE-style construction with a copper core center electrode and nickel ground core
• 5000 ohm resistance for controlled electrical performance
• Pre-gapped at 1.0 mm for direct replacement service
• 14.00 mm thread diameter, 26.50 mm reach, and flat seat design
• Manufacturer heat range 20 for specified engine applications

Product Line Details

The Denso Iridium TT line is engineered to combine everyday durability with performance-focused ignition characteristics. This design uses a twin-tip electrode layout to help maintain spark efficiency while preserving the OE-style service life expected in modern Lexus and Toyota engines.

Detailed Description

Denso 4705 is a direct-fit spark plug for a wide range of Lexus and Toyota vehicles, including Lexus ES350, IS300, IS350, LC500, RX350, and Toyota Camry, Tacoma, Highlander, Avalon, and Sienna applications. It is also listed for multiple GS, LS, RC, and RX variants across 2006-2023 model years. The iridium center tip and platinum twin-tip ground configuration are selected to support reliable combustion, smooth throttle response, and consistent ignition under normal driving conditions.

This part cross-references DENSO Auto Parts IKBH20TT and Toyota 90919-01249 for the same application. Part number 4705 is a practical OE replacement choice when servicing ignition systems on Lexus and Toyota engines that call for this plug specification.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from weakened ignition output
• Rough idle related to inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Maintenance replacement for OE-style ignition service intervals

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. This plug uses a 16.0 mm hex and a flat seat, so use the correct spark plug socket and torque specification for the engine. Check the gap against service requirements before installation, even though the plug is pre-gapped at 1.0 mm. Confirm vehicle-specific fitment for your Lexus or Toyota model and engine code before ordering.

Quality Assurance

Denso manufactures this Iridium TT spark plug as an OE-style replacement built around durable electrode materials and controlled resistance for stable ignition performance. It is listed for direct fitment across confirmed Lexus and Toyota applications, including 2020-2022 Lexus ES350, 2020-2022 Toyota Camry, and 2016-2019 Toyota Tacoma models.