Denso 3443 Spark Plug

Denso Iridium Long Life Spark Plug 3443

Denso 3443 is an Iridium Long Life spark plug built for OE-style ignition performance, durability, and emissions control. It uses an iridium center electrode, a platinum chip ground tip design, and a 1.1 mm pre-gap to support consistent spark delivery in a wide range of import and domestic applications.

Key Features

• Iridium center electrode tip for stable ignition performance
• Platinum chip ground electrode tip design for extended service life
• 5000 ohm resistor for reduced electrical noise
• Copper core center electrode and nickel ground electrode core for heat transfer support
• Pre-gapped at 1.1 mm
• Flat seat, 14.0 mm thread diameter, 19.0 mm reach, and 16.0 mm hex size
• Manufactured to OE performance, durability, and emissions standards

Product Line Details

The Denso Iridium Long Life line is focused on long-service ignition components for vehicles that require precise spark control and dependable operation over extended intervals. Part number 3443 follows that OE-oriented approach with materials and dimensions selected for factory-style fitment and consistent combustion performance.

Detailed Description

Denso 3443 spark plug is a direct-fit ignition component for many vehicles across Audi, Subaru, Volvo, Saab, Acura, Mazda, Chevrolet, and more. It is commonly searched as a spark plug for 2004-2008 Chevrolet Aveo, 2002-2006 Audi A4 Quattro, and 1998-2004 Subaru Forester applications, as well as other long-life OE replacement needs. The iridium tip helps maintain a consistent spark, while the platinum chip ground design supports durability in demanding secondary ignition systems. This part cross-references DENSO Auto Parts SK20PR-L11 for the same application.

What It Helps Address

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

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Denso 3443 uses a flat seat, 14.0 mm thread diameter, 19.0 mm reach, and manufacturer heat range 16. Check the gap against the vehicle service specification before installing, even though the plug is pre-gapped at 1.1 mm. Confirm vehicle-specific fitment for models such as Subaru Legacy, Volvo S60, and Honda Civic before purchase.

Quality Assurance

This spark plug is manufactured to meet strict OE performance, durability, and emissions standards. The design and material selection reflect Denso’s factory-level approach to ignition service parts for long-life replacement use.