Denso 3433 Spark Plug

Denso Iridium Long Life Spark Plug 3433

Denso 3433 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 chip ground tip to support stable ignition and long service life in a wide range of import and domestic applications, including Subaru WRX STI, Honda Civic, and Dodge Ram 1500 fitments.

Key Features

• Iridium center electrode tip material for consistent spark performance
• Platinum chip ground electrode tip design for extended wear resistance
• Copper core center electrode and nickel ground electrode core for efficient heat transfer
• Pre-gapped to 1.1 mm for OE-style setup
• 5000 ohm resistance for ignition system compatibility
• Flat seat, 14.00 mm thread diameter, 26.50 mm reach, and 16.0 mm hex size
• Manufactured to meet strict OE performance, durability, and emissions standards

Product Details

The Denso Iridium Long Life line is engineered for drivers who want a spark plug that follows original equipment expectations for ignition quality and durability. Part number 3433 is a direct-style replacement for many Subaru, Honda, Chrysler, Dodge, Jeep, Ram, Mitsubishi, Suzuki, Mercedes-Benz, BMW, and Volvo applications. It is a strong match for long-tail searches such as Denso 3433 spark plug for Subaru WRX STI, Denso 3433 for Honda Civic, and iridium long life spark plug for Dodge Ram 1500.

This part cross-references DENSO Auto Parts SK20HPR-L11 and Subaru 22401 AA630 for the same application.

Common Uses

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire conditions related to plug wear or gap drift
• Reduced fuel economy from inconsistent combustion
• Loss of throttle response in high-mileage ignition service intervals

Installation Notes

Verify engine application by year, make, and model before installation. This spark plug uses a flat seat and 14.00 mm thread diameter, so confirm the cylinder head specification matches the plug design. Follow the vehicle service manual for torque, gap verification, and ignition system inspection. Some listed applications note special cylinder requirements or OE-recommended plug configurations, including Subaru WRX STI, Honda Civic, and Dodge Durango fitments.

• Fits 2017-2018 Subaru WRX STI, N/A
• Fits 2017 Mitsubishi Mirage, N/A
• Fits 2015 Mitsubishi Mirage, N/A
• Fits 2017 Mitsubishi Mirage G4, N/A
• Fits 2015-2017 Subaru Legacy, N/A
• Fits 2005-2008 Subaru Legacy, N/A
• Fits 2015-2017 Subaru Outback, N/A
• Fits 2005-2008 Subaru Outback, N/A
• Fits 2001-2003 Subaru Outback, N/A
• Fits 2013-2016 Subaru WRX STI, N/A
• Fits 2013-2014 Subaru Impreza, N/A
• Fits 2004-2008 Subaru Impreza, N/A
• Fits 2013-2014 Subaru WRX, N/A
• Fits 2011-2013 Ram 1500, N/A
• Fits 2013 Subaru Forester, N/A
• Fits 2004-2010 Subaru Forester, N/A
• Fits 2009-2013 Suzuki Grand Vitara, N/A
• Fits 2011-2012 Dodge Durango, N/A
• Fits 2008-2009 Dodge Durango, N/A
• Fits 2011-2012 Subaru Forester, N/A
• Fits 2010-2012 Subaru Impreza, N/A
• Fits 2009-2012 Subaru Legacy, N/A
• Fits 2011 Honda Civic, N/A
• Fits 2007-2009 Honda Civic, N/A
• Fits 2011 Ram Dakota, N/A
• Fits 2010 Dodge Dakota, N/A
• Fits 2010 Dodge Ram 1500, N/A
• Fits 2009-2010 Dodge Ram 2500, N/A
• Fits 2010 Honda Civic, N/A
• Fits 2008-2010 Jeep Commander, N/A
• Fits 2008-2009 Chrysler Aspen, N/A
• Fits 2009 Dodge Dakota, N/A
• Fits 2009 Dodge Durango, N/A
• Fits 2008-2009 Dodge Ram 1500, N/A
• Fits 2009 Jeep Grand Cherokee, N/A
• Fits 2008 Jeep Grand Cherokee, N/A
• Fits 2006-2007 Subaru B9 Tribeca, N/A
• Fits 2003-2006 Mercedes-Benz CL55 AMG, N/A
• Fits 2004-2006 Subaru Baja, N/A

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards, with materials selected to support stable ignition over extended service life. The Iridium Long Life design reflects Denso’s OE-focused approach for vehicles that require precise spark control and dependable combustion.