Denso 3444 Spark Plug

Denso Iridium Long Life Spark Plug 3444

Denso Iridium Long Life spark plug 3444 is built for OE-level performance, durability, and emissions control. It uses an iridium center electrode, platinum chip ground tip design, and a 1.1 mm pre-gap to support consistent ignition in modern engines.

This Denso 3444 spark plug is a direct-fit choice for select Nissan Frontier, Nissan Sentra, Toyota Corolla, Toyota Prius, and other import applications that call for an iridium long life plug. It is also cross-referenced to DENSO Auto Parts SC20HR11 for the same application.

Key Features

• Iridium center electrode tip material for stable spark performance
• Platinum chip ground electrode tip design for extended service life
• 5000 ohm resistor for ignition noise suppression
• Copper core center electrode and nickel ground electrode core for heat transfer support
• Flat seat design with 12.00 mm thread diameter and 14.3 mm hex size
• Manufacturer heat range 20 and 26.50 mm reach
• OE-style construction for select Nissan, Toyota, Jaguar, Land Rover, Lexus, Scion, Pontiac, Suzuki, BMW, and Mercedes-Benz applications

Detailed Description

Denso Iridium Long Life 3444 is engineered as an OE-style spark plug for engines that require precise ignition and long service intervals. The iridium center electrode helps maintain a consistent spark, while the platinum chip ground design supports durability under repeated combustion cycles. With a 1.1 mm pre-gap, flat seat, and resistor construction, this plug is suited to factory-style ignition systems that depend on accurate fit and stable electrical performance. It is a strong match for long-tail searches such as Denso 3444 spark plug for 2009-2011 Toyota Corolla, 2010-2011 Toyota Prius spark plug replacement, and 2016-2019 Nissan Sentra iridium spark plug.

Vehicle coverage includes Fits 2017-2019 Nissan Frontier, N/A; Fits 2016-2019 Nissan Sentra, N/A; Fits 2005-2016 Nissan Frontier, N/A; Fits 2013-2015 Nissan Sentra, N/A; Fits 2009-2011 Toyota Corolla, N/A; Fits 2010-2011 Toyota Prius, N/A; Fits 2011 Lexus CT200h, N/A; and Fits 2008-2011 Scion xD, N/A. Additional coverage includes select Jaguar, Land Rover, Suzuki, Pontiac, and Toyota Matrix applications. Check the listed fitment before ordering to confirm engine application.

What It Helps Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Rough idle and inconsistent combustion
• Reduced fuel economy from degraded spark performance
• Emissions issues related to aging secondary ignition components

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the original plug before installation. Use the correct torque specification for the engine and inspect coil boots and ignition components at the same time. This plug is listed for N/A position applications, so confirm the engine location and factory specification for your vehicle before service. For fitment searches, Denso 3444 is commonly referenced for Nissan Frontier and Nissan Sentra spark plug replacement, as well as Toyota Corolla and Toyota Prius applications.

Quality Assurance

Denso states that this spark plug is manufactured to OE performance, durability, and emissions standards. The Iridium Long Life line is built for factory-style service expectations in modern ignition systems.