Denso 3419 Spark Plug

Denso Iridium Long Life Spark Plug 3419

Denso 3419 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It is a direct-fit ignition service part for select Honda, Acura, and Nissan/Datsun applications, including Honda Civic, Honda S2000, Acura RSX, and Acura NSX fitments.

Key Features

• Iridium center electrode tip for stable ignition performance
• Platinum chip ground electrode tip design
• 5000 ohm resistor for reduced electrical noise
• Copper center electrode core and nickel ground electrode core
• Pre-gapped to 1.1 mm
• 14.00 mm thread diameter, 19.00 mm reach, 16.0 mm hex size
• Flat seat design for the specified OE-style applications

Iridium Long Life Design

The Denso Iridium Long Life line focuses on extended service life and consistent ignition characteristics for modern engines. Part number 3419 uses an iridium center electrode to support reliable spark delivery, while the platinum chip ground tip and OE-style construction help maintain the performance standards expected in factory-equivalent ignition service. This makes Denso 3419 a practical choice for drivers servicing a Honda Civic, Honda S2000, Acura RSX, or Acura NSX with the correct factory application.

This part cross-references DENSO Auto Parts SK22PR-M11S and Honda 98079-571-BH for the same application.

Fitment

• Fits 2006-2011 Honda Civic, N/A, Iridium Long Life
• Fits 2000-2009 Honda S2000, N/A, Iridium Long Life
• Fits 2002-2006 Acura RSX, N/A, Iridium Long Life
• Fits 1993 Acura NSX, N/A, Iridium Long Life
• Fits 1991 Acura NSX, N/A, Iridium Long Life

What It Is Used For

• Replacing worn spark plugs that cause rough idle
• Restoring ignition consistency during acceleration
• Addressing misfire-related drivability concerns
• Supporting proper combustion in OE-specified engines
• Servicing tune-up intervals on select Honda and Acura models

Installation Notes and Tips

Verify the engine application against the vehicle’s original spark plug specification before installation. Confirm thread diameter, reach, seat type, and pre-gap size match the OE requirement for the vehicle. Use proper spark plug service procedures and torque specifications for the cylinder head material and engine design.

Quality Assurance

Denso manufactures this spark plug to meet strict OE performance, durability, and emissions standards. The 3419 is built as an OE-style replacement for the listed applications and is backed by Denso’s manufacturing standards for ignition components.