Denso 3442 Spark Plug

Denso Iridium Long Life Spark Plug 3442

Denso 3442 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It uses an iridium center electrode with a platinum needle ground design to support stable ignition and consistent combustion in a wide range of Nissan, INFINITI, Subaru, Jaguar, Land Rover, and Mercedes-Benz applications.

The Iridium Long Life (SIP) line focuses on long service intervals and factory-style operation. For drivers searching for a Denso 3442 spark plug for Nissan Maxima, Subaru Forester, or INFINITI QX60 applications, this plug matches the OE-style specifications used across many late-model and earlier performance and luxury platforms.

Key Features

• Iridium center electrode tip for precise spark delivery
• Platinum needle ground electrode tip design
• Needle-to-needle ground configuration for consistent ignition
• 5000 ohm resistance for OE-style electrical performance
• Pre-gapped at 1.1 mm
• Copper center electrode core and nickel ground electrode core
• Flat seat design with 12.00 mm thread diameter
• Manufactured to OE performance, durability, and emissions standards

Product Details

This Denso Iridium Long Life spark plug is engineered around a fine-wire iridium center electrode and platinum ground tip to promote reliable ignition under everyday driving and higher-load conditions. The 26.50 mm reach, 14.3 mm hex size, and manufacturer heat range 22 support OE-style fitment across many direct-application vehicles. Part number 3442 is commonly searched for Nissan Altima, Nissan Pathfinder, Subaru Outback, and Jaguar F-Type service work where factory-equivalent ignition performance is required.

This part cross-references DENSO Auto Parts FXE22HR11 and Nissan 22401-1LA1C for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark output
• Misfire conditions related to aged ignition components
• Reduced fuel economy from incomplete combustion
• Loss of throttle response from degraded plug performance

Installation Notes and Tips

Verify engine application by year, make, model, and OE reference before installation. Confirm the 1.1 mm pre-gap and inspect coil boots, ignition coils, and plug wells for wear or contamination during service. Use the correct torque procedure for the engine and avoid over-tightening the flat-seat plug. This plug is listed for broad OE-style coverage, including Fits 2022-2023 Nissan Armada, N/A; Fits 2021-2023 Subaru Forester, N/A; and Fits 2022-2023 INFINITI QX60, N/A.

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards. The Iridium Long Life (SIP) design is built for factory-style ignition consistency across the listed applications, including Nissan, INFINITI, Subaru, Jaguar, Land Rover, and Mercedes-Benz vehicles.