Denso 3353 Spark Plug

Denso Iridium Long Life Spark Plug 3353

Denso 3353 is an Iridium Long Life spark plug built for secondary ignition service in select Lexus applications. It is engineered to meet OE performance, durability, and emissions standards while delivering stable ignition performance for daily driving.

Key Features

• Iridium center electrode tip for consistent spark delivery
• Double Platinum Chip ground electrode tip design
• 5000 ohm resistor for ignition noise suppression
• Copper center electrode core and nickel ground electrode core
• Flat seat design with 14.00 mm thread diameter
• 1.1 mm pre-gap size, 16.0 mm hex size, and 19.00 mm reach
• Manufacturer heat range 16

Iridium Long Life Design

The Iridium Long Life line is Denso’s OE-focused spark plug family for extended service intervals and consistent combustion performance. On Lexus GS300 and Lexus IS300 applications, Denso 3353 supports reliable ignition characteristics with an iridium center electrode and a double platinum chip ground design that helps maintain spark stability over time.

Fitment

• Fits 2001-2005 Lexus GS300, N/A, Iridium Long Life
• Fits 2001-2005 Lexus IS300, N/A, Iridium Long Life

What This Spark Plug Helps Address

• Rough idle caused by worn ignition components
• Hard starting related to weak spark output
• Misfire conditions from degraded plug electrodes
• Reduced fuel economy from inconsistent combustion
• Emissions issues tied to aging spark plugs

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and heat range before installation. Check the pre-gap against the vehicle specification and inspect ignition coils, boots, and wiring for wear before replacing plugs. For Lexus GS300 and Lexus IS300 service, confirm the engine application matches the listed fitment before installation.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards. Part number 3353 is a direct-reference ignition component for select Lexus applications and cross-references Toyota 90919-01219 and Denso Auto Parts SK16R-P11 for the same application.