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Product Details

Denso Parts

Iridium Long-Life Spark Plug (3421) by Denso®. 1 Piece. Gap: 0.044". O.E. Recommended Iridium Long Life. Patented Iridium Alloy Plug (90% Ir) with Platinum Ground Strap. Denso's patented Iridium alloy is more durable than even Platinum, allowing the center electrode to be shrunk to only 0.7 mm in diameter. This produces a dramatic improvement in ignitability and spark plug life. Denso's Iridium Long Life spark plug is standard equipment with a number of automakers including GM, Toyota, Honda, and Mitsubishi.

Denso - Iridium Spark PlugsDenso - VideosDenso - About

Features:

  • Fine-wire iridium center electrode
  • Platinum ground electrode
  • 360 degree laser-welded spark tip
  • Sustained spark performance over 100,000 miles
  • Withstands higher pressures and temperatures
  • Reduced spark plug wear and erosion

The Denso Iridium Long Life plug is fast becoming the standard for today's high-tech engines. Properties of Denso's patented Iridium alloy have broken through the spark plug technology barrier. Employing a revolutionary new 360° laser-welding process, Denso has created a spark plug unlike anything on the market today. Designed for durability under the most extreme conditions, Denso's patented Iridium alloy is six times harder and eight times stronger than conventional Platinum and can handle temperatures in excess of 4,000°F.

Denso® factories are QS9000 and ISO9000 certified worldwide, just one of the many reasons why zero defects for parts produced in the millions is a reality for DENSO. A recipient of the prestigious Deming Award for quality in 1961, Denso spent over five decades perfecting technology and processes, a claim that few automotive manufacturers can make. Denso First Time Fit™ products — including A/C compressors, starters, alternators, oxygen sensors, ignition wire sets, fuel pumps, cabin air, oil and air filters, wiper blades and more — are products built and tested to OE-standard offered for the aftermarket by DENSO. Each of these products is precision-built for exact replacement so you don't have to worry about doing the same job twice.

Brand:
Part Number:
3421
UPC:
042511034211

Warranty Information

Denso Products are covered by a limited lifetime warranty to be free from defects in material and workmanship from the date of purchase by the Original Purchaser. This warranty does not apply to any Products that have been subjected to misuse, mishandling, misapplication, neglect (including but not limited to improper maintenance), improper installation, or alterations.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

2017 Lexus GX 
2017 Lexus LX 
2017 Toyota Land Cruiser 
2017 Toyota Sequoia 
2017 Toyota Tundra 
2016 Lexus GX 
2016 Lexus LX 
2016 Toyota Land Cruiser 
2016 Toyota Sequoia 
2016 Toyota Tundra 
2015 Lexus GX 
2015 Lexus LX 
2015 Toyota Land Cruiser
  • Base
2015 Toyota Sequoia
  • Limited / Platinum / SR5
2015 Toyota Tacoma
  • 4.0L
2015 Toyota Tundra
  • 1URFE Engine / 3URFBE Engine / 3URFE Engine
2014 Lexus GX 
2014 Lexus LX 
2014 Toyota Land Cruiser
  • Base
2014 Toyota Sequoia
  • Limited / Platinum / SR5
2014 Toyota Tacoma
  • 2.7L
2014 Toyota Tundra
  • 4.0L
2014 Toyota Tundra
  • 1URFE Engine / 3URFBE Engine / 3URFE Engine
2013 BMW 128i
  • Base
2013 BMW 328i / 328i xDrive
  • Base 3.0L
2013 Lexus GX
  • Base / Premium
2013 Lexus LX 
2013 Toyota 4Runner 
2013 Toyota FJ Cruiser
  • Base
2013 Toyota Land Cruiser
  • Base
2013 Toyota Sequoia
  • Limited / Platinum / SR5
2013 Toyota Tacoma
  • 2.7L
2013 Toyota Tacoma
  • Base / Pre Runner / X-Runner 4.0L
2013 Toyota Tundra
  • 4.0L
2013 Toyota Tundra
  • Platinum
2013 Toyota Tundra
  • Limited 3URFBE Engine / 3URFE Engine
2013 Toyota Tundra
  • Base 1URFE Engine / 3URFBE Engine / 3URFE Engine
2013 Volvo C30
  • T5 / T5 R-Design
2013 Volvo C70
  • T5
2012 BMW 128i 
2012 BMW 328i / 328i xDrive
  • Naturally Aspirated
2012 BMW X3
  • XDrive28i Naturally Aspirated
2012 Lexus GX
  • Premium
2012 Mitsubishi Eclipse
  • GS / GS Sport / SE / Spyder GS Sport / Spyder SE
2012 Toyota 4Runner 
2012 Toyota FJ Cruiser
  • 1GRFE Engine
2012 Toyota Sequoia
  • Limited / Platinum / SR5
2012 Toyota Tacoma
  • Pre Runner 2.7L
2012 Toyota Tacoma
  • Pre Runner / X-Runner 4.0L
2012 Toyota Tundra
  • 4.0L
2012 Toyota Tundra
  • 1URFE Engine
2012 Toyota Tundra
  • Limited 3URFBE Engine / 3URFE Engine
2012 Volvo C30
  • T5
2012 Volvo C70
  • T5
2011 BMW 128i 
2011 BMW 328i / 328i xDrive
  • N52 Engine
2011 BMW 528i
  • 3.0L N52B30A Engine
2011 BMW X3
  • N52B30A Engine
2011 BMW Z4
  • SDrive30i
2011 Lexus GX
  • Premium
2011 Lexus LX 
2011 Mercedes G55 AMG
  • 5.5L
2011 Mitsubishi Eclipse
  • GS / GS Sport / Spyder GS
2011 Mitsubishi Galant
  • ES / SE
2011 Saab 9-5
  • Aero / Turbo6
2011 Toyota 4Runner 
2011 Toyota FJ Cruiser
  • 1GRFE Engine
2011 Toyota Land Cruiser
  • 3URFE Engine
2011 Toyota Sequoia
  • Limited / Platinum / SR5
2011 Toyota Tacoma
  • Pre Runner 2.7L
2011 Toyota Tacoma
  • Pre Runner / X-Runner 4.0L
2011 Toyota Tundra
  • SR5 4.0L
2011 Toyota Tundra
  • Limited 3URFBE Engine / 3URFE Engine
2011 Toyota Tundra
  • SR5 1URFE Engine / 3URFBE Engine / 3URFE Engine
2011 Volvo C30
  • T5
2011 Volvo C70
  • T5
2011 Volvo S40
  • T5 / T5 R-Design
2011 Volvo V50
  • T5 / T5 R-Design
2010 BMW 128i 
2010 BMW 328i / 328i xDrive
  • N51B30A Engine / N52 Engine
2010 BMW 528i / 528i xDrive 
2010 BMW X3
  • XDrive30i N52 Engine
2010 BMW X5
  • XDrive30i
2010 BMW Z4
  • SDrive30i
2010 Cadillac SRX
  • 2.8L
2010 Lexus GX 
2010 Lexus LX 
2010 Mercedes G55 AMG
  • 5.5L
2010 Mitsubishi Eclipse
  • GS / GS Sport / Spyder GS
2010 Mitsubishi Galant 
2010 Saab 9-5
  • Aero
2010 Toyota 4Runner
  • 4.0L
2010 Toyota 4Runner
  • 2.7L
2010 Toyota FJ Cruiser
  • 1GRFE Engine
2010 Toyota Land Cruiser
  • 3URFE Engine
2010 Toyota Sequoia
  • Limited / Platinum / SR5
2010 Toyota Tacoma
  • 2.7L
2010 Toyota Tacoma
  • 1GRFE Engine
2010 Toyota Tundra
  • 4.0L
2010 Toyota Tundra
  • 1URFE Engine / 3URFBE Engine / 3URFE Engine
2010 Volvo C30
  • T5
2010 Volvo C70
  • T5
2010 Volvo S40
  • T5 R-Design
2010 Volvo S40
  • 2.4i
2010 Volvo S80
  • T6
2010 Volvo S80
  • 3.2 B6324S Engine
2010 Volvo V50
  • T5 R-Design
2010 Volvo V50
  • 2.4i
2010 Volvo V70
  • B6324S Engine
2010 Volvo XC60
  • B6304T2 Engine / B6324S Engine
2010 Volvo XC70
  • B6304T2 Engine / B6324S Engine
2010 Volvo XC90
  • 3.2L
2009 BMW 128i 
2009 BMW 328i / 328i xDrive
  • N51B30A Engine / N52 Engine
2009 BMW 528i / 528i xDrive 
2009 BMW X3
  • N52 Engine
2009 BMW X5
  • XDrive30i
2009 BMW Z4
  • SDrive30i
2009 Lexus LX 
2009 Mercedes G55 AMG
  • 5.5L
2009 Mercedes SLR McLaren
  • 5.5L
2009 Mitsubishi Eclipse
  • GS / Spyder GS
2009 Mitsubishi Galant
  • ES / Sport Edition
2009 Saab 9-3
  • Aero
2009 Saab 9-3
  • Aero / Aero XWD
2009 Toyota 4Runner
  • 4.0L
2009 Toyota FJ Cruiser
  • 1GRFE Engine
2009 Toyota Land Cruiser
  • 5.7L
2009 Toyota Sequoia
  • 5.7L
2009 Toyota Tacoma
  • 2.7L
2009 Toyota Tacoma
  • 1GRFE Engine
2009 Toyota Tundra
  • 5.7L
2009 Toyota Tundra
  • 4.0L
2009 Volvo C30
  • T5
2009 Volvo C70
  • T5
2009 Volvo S40
  • T5
2009 Volvo S40
  • 2.4i B5244S4 Engine / B5244S7 Engine
2009 Volvo S60
  • T5
2009 Volvo S80
  • 3.0L
2009 Volvo S80
  • 3.2
2009 Volvo V50
  • T5
2009 Volvo V50
  • 2.4i
2009 Volvo V70 
2009 Volvo XC70 
2009 Volvo XC90
  • 3.2
2008 BMW 128i 
2008 BMW 328i / 328xi 
2008 BMW 528i / 528xi 
2008 BMW X3
  • 3.0si N52 Engine
2008 BMW X5
  • N52B30A Engine
2008 BMW Z4
  • Coupe 3.0si / Roadster 3.0i / Roadster 3.0si
2008 Lexus LX 
2008 Mercedes G Class
  • 5.5L
2008 Mercedes SL55 AMG / SLR McLaren
  • 5.5L V8
2008 Mitsubishi Eclipse
  • 2.4L
2008 Mitsubishi Galant
  • DE / ES
2008 Saab 9-3
  • Aero
2008 Saab 9-3
  • Turbo X
2008 Toyota 4Runner
  • Limited / Sport / SR5 4.0L
2008 Toyota FJ Cruiser
  • 1GRFE Engine
2008 Toyota Land Cruiser
  • 5.7L
2008 Toyota Sequoia
  • 5.7L
2008 Toyota Tacoma
  • 2.7L
2008 Toyota Tacoma
  • 1GRFE Engine
2008 Toyota Tundra
  • 5.7L
2008 Toyota Tundra
  • 4.0L
2008 Volvo C30
  • 2.5L
2008 Volvo C70
  • 2.5L
2008 Volvo S40
  • 2.5L B5254T7 Engine
2008 Volvo S40
  • 2.4i B5244S4 Engine / B5244S7 Engine
2008 Volvo S60
  • Gas 2.4L
2008 Volvo S80
  • 3.2 / T6
2008 Volvo V50
  • 2.5L
2008 Volvo V50
  • 2.4i
2008 Volvo V70 
2008 Volvo XC90
  • 3.2L
2007 BMW 328i / 328xi 
2007 BMW 525i / 525xi / 530i / 530xi
  • N52 Engine
2007 BMW X3
  • 3.0L N52 Engine
2007 BMW X5
  • Gas N52B30A Engine
2007 BMW Z4
  • Roadster 3.0si
2007 Mercedes G55 AMG 
2007 Mercedes SL55 AMG / SLR McLaren
  • 5.5L
2007 Mitsubishi Eclipse
  • GS / Spyder GS
2007 Mitsubishi Galant
  • DE / ES
2007 Nissan Maxima
  • SE
2007 Saab 9-3
  • 2.8L
2007 Toyota 4Runner
  • 1GRFE Engine
2007 Toyota FJ Cruiser 
2007 Toyota Tacoma
  • 2.7L
2007 Toyota Tacoma
  • 1GRFE Engine
2007 Toyota Tundra
  • 5.7L
2007 Toyota Tundra
  • 4.0L
2007 Volvo C70
  • 2.5L
2007 Volvo S40
  • 2.5L
2007 Volvo S40
  • Gas 2.4L B5244S4 Engine / B5244S7 Engine
2007 Volvo S60
  • R / T5
2007 Volvo S80
  • 3.2L
2007 Volvo V50
  • Gas 2.4L
2007 Volvo V50
  • 2.5L B5254T3 Engine
2007 Volvo V70
  • R
2007 Volvo XC90
  • 3.2L
2006 BMW 325i / 325xi / 330i / 330xi
  • 3.0L
2006 BMW 525i / 525xi / 530i / 530xi
  • N52 Engine
2006 BMW Z4
  • Coupe 3.0si
2006 Honda Civic
  • 1.3L
2006 Honda Insight 
2006 Mercedes G55 AMG 
2006 Mercedes S55 AMG 
2006 Mercedes SL55 AMG / SLR McLaren
  • 5.5L
2006 Mitsubishi Eclipse
  • 2.4L
2006 Mitsubishi Galant
  • DE / ES
2006 Mitsubishi Lancer
  • Ralliart
2006 Mitsubishi Outlander 
2006 Saab 9-3
  • 2.8L
2006 Toyota 4Runner
  • 1GRFE Engine
2006 Toyota Tacoma
  • 2.7L
2006 Toyota Tacoma
  • 1GRFE Engine
2006 Toyota Tundra
  • 4.0L
2006 Volvo C70
  • 2.5L
2006 Volvo S40
  • Gas 2.4L
2006 Volvo S40
  • 2.5L B5254T3 Engine
2006 Volvo S60
  • R / T5
2006 Volvo V50
  • Gas 2.4L
2006 Volvo V50
  • 2.5L B5254T3 Engine
2006 Volvo V70
  • R
2005 Cadillac STS
  • 3.6L
2005 Honda Insight 
2005 Infiniti QX56 
2005 Mercedes G55 AMG 
2005 Mercedes S55 AMG
  • 5.5L
2005 Mercedes SL55 AMG / SLR McLaren
  • 5.5L
2005 Mitsubishi Eclipse
  • GS / Spyder GS
2005 Mitsubishi Galant
  • DE / ES
2005 Mitsubishi Lancer
  • Ralliart
2005 Mitsubishi Outlander 
2005 Toyota 4Runner
  • 4.0L
2005 Toyota Tacoma
  • 4.0L
2005 Toyota Tacoma
  • 2.7L
2005 Toyota Tundra
  • 4.0L
2005 Volvo S40
  • I
2005 Volvo S40
  • T5 B5254T3 Engine
2005 Volvo S60
  • 2.3L B5234T3 Engine
2005 Volvo S60
  • 2.5L B5254T2 Engine / B5254T4 Engine
2005 Volvo V50
  • I
2005 Volvo V50
  • 2.5L B5254T3 Engine
2005 Volvo V70
  • R
2004 Cadillac SRX
  • 3.6L
2004 Honda Insight 
2004 Mercedes S55 AMG
  • 5.5L
2004 Mercedes SL55 AMG
  • 5.5L
2004 Mitsubishi Eclipse
  • GS / RS / Spyder GS
2004 Mitsubishi Galant
  • 2.4L
2004 Mitsubishi Lancer
  • Ralliart / Sportback
2004 Mitsubishi Outlander 
2004 Toyota 4Runner
  • 4.0L
2004 Volvo S40
  • I
2004 Volvo S40
  • T5 B5254T3 Engine
2004 Volvo S60
  • 2.5L
2004 Volvo V70
  • R
2003 Honda Insight 
2003 Infiniti FX35 
2003 Mercedes E55 AMG
  • 5.5L
2003 Mercedes S55 AMG
  • 5.5L
2003 Mercedes SL55 AMG
  • 5.5L
2003 Toyota 4Runner
  • 4.0L
2002 Honda Insight 
2001 Honda Insight 
2000 Honda Insight 
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