Denso 3372 Spark Plug

Denso Iridium Long Life Spark Plug 3372

Denso 3372 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It uses an iridium center electrode, a platinum chip ground tip, and a 5,000-ohm resistor to support consistent ignition performance in select Mazda, Nissan, and INFINITI applications.

Key Features

• Iridium center electrode tip material for stable spark performance
• Platinum chip ground electrode tip design for extended service life
• 5,000-ohm resistor to help control electrical noise
• Copper center electrode core and nickel ground electrode core
• Pre-gapped to 1.1 mm for the specified application
• 14.0 mm thread diameter, 19.0 mm reach, and flat seat design
• 16.0 mm hex size for proper service-tool fitment

Product Details

The Denso Iridium Long Life line is engineered for drivers who want a spark plug that follows OE performance and durability standards while maintaining emissions-focused operation. Part number 3372 is a direct-fit style spark plug for select 1998-2009 Nissan Altima, Sentra, Frontier, and Xterra applications, plus Mazda B2300 and INFINITI G20 coverage. This part cross-references DENSO Auto Parts SK22PR-M11 for the same application.

Built with an iridium center electrode and a platinum chip ground tip, Denso 3372 is specified to maintain reliable ignition characteristics under normal engine operating conditions. The 1.1 mm pre-gap, flat seat, and 19.0 mm reach help match the factory-style requirements for the listed vehicles, including Mazda B2300 spark plug replacement and Nissan Frontier spark plug service.

Common Issues This Part Can Address

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

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the original plug before installation. Use the correct 16.0 mm spark plug socket and follow the vehicle manufacturer’s torque specification. Check the pre-gap against the engine’s requirements before installing Denso 3372, especially on Nissan Altima, Nissan Sentra, and Mazda B2300 applications.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards. The Iridium Long Life design is intended to support consistent service life and dependable ignition performance in the listed applications.

• Fits 2009 Mazda B2300, N/A
• Fits 2006 Mazda B2300, N/A
• Fits 2001-2003 Mazda B2300, N/A
• Fits 2002-2004 Nissan Frontier, N/A
• Fits 2002-2004 Nissan Xterra, N/A
• Fits 2001 INFINITI G20, N/A
• Fits 2001 Nissan Sentra, N/A
• Fits 1998 Nissan Altima, N/A