Denso 3493 Spark Plug

Denso Iridium Long Life Spark Plug 3493

Denso 3493 is an Iridium Long Life spark plug built for OE-level ignition performance, durability, and emissions control. It is a direct-fit ignition component for select Toyota Tacoma applications, including 2014-2016 Toyota Tacoma models listed below.

Key Features

• Iridium center electrode tip for stable spark performance and long service life
• Platinum chip ground electrode tip design for consistent ignition characteristics
• 5000 ohm resistor helps reduce electrical noise in the ignition system
• Copper center electrode core and nickel ground electrode core for reliable heat transfer
• 1.1 mm pre-gap size, 14.00 mm thread diameter, 26.50 mm reach, and 16.0 mm hex size
• Flat seat design for the specified OE-style application

Product Details

This Denso Iridium Long Life spark plug is engineered to meet strict original-equipment standards for performance, durability, and emissions. The iridium center electrode supports precise ignition, while the platinum chip ground electrode design helps maintain consistent firing characteristics over extended service intervals. Denso 3493 is a strong OE replacement choice for drivers servicing a Toyota Tacoma ignition system and looking for the correct spark plug specification by application.

This part cross-references DENSO Auto Parts SK20HR-A11 and Toyota 90919-01266 for the same application.

Vehicle Fitment

• Fits 2016 Toyota Tacoma, N/A, to 08/2015; Iridium Long Life
• Fits 2015 Toyota Tacoma, N/A, Iridium Long Life
• Fits 2014 Toyota Tacoma, N/A, from 06/2013; Iridium Long Life

Common Issues This Part Can Address

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

Installation Notes and Tips

Verify the engine application and production date before installation, especially for 2014 and 2016 Toyota Tacoma fitments with date-specific notes. Confirm the specified thread diameter, reach, seat type, and pre-gap size match the original plug requirements before service. Use proper spark plug handling and torque procedures to protect the cylinder head and ensure correct sealing.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards for the listed applications. The Iridium Long Life design is intended to support dependable ignition performance in the specified Toyota Tacoma fitments.