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DENSO spark plugs

DENSO spark plugs are the preferred option for dependable and high-performance ignition. Looking for Iridium Power, DENSO Platinum TT, or the innovative Double Platinum plugs? We've got these favorites and more. If you're a DENSO enthusiast, be sure to explore our DENSO wire sets, ignition coils, and O2 sensors. And don't forget, at Sixity Auto, we proudly offer a comprehensive selection of spark plugs from other leading brands such as NGK, Autolite, Bosch, E3, and Champion.

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  1. DENSO Spark Plug
    DENSO Iridium Long Life 3491 FK20HBR8 Spark Plug
    Special Price $17.88 Regular Price $25.99
    DENSO
  2. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3491 FK20HBR8 Spark Plugs
    Rating:
    90%
    4  Reviews
    Special Price $102.91 Regular Price $146.99
    DENSO
  3. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3421 SK20HR11 Spark Plugs
    Special Price $55.97 Regular Price $79.99
    DENSO
  4. DENSO Spark Plug
    DENSO Iridium Power 5383 IUF22 Spark Plug
    Special Price $9.31 Regular Price $12.99
    DENSO
    Out of stock
  5. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3417 SK16HR11 Spark Plugs
    Special Price $44.36 Regular Price $62.99
    DENSO
  6. DENSO Spark Plug
    8 pc DENSO Iridium Long Life 3421 SK20HR11 Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $74.33 Regular Price $105.99
    DENSO
  7. DENSO Spark Plug
    4 pc DENSO Standard U-Groove 3137 Q16PR-U Spark Plugs
    Special Price $10.41 Regular Price $14.99
    DENSO
  8. DENSO Spark Plug
    8 pc DENSO Iridium Long Life 3297 SK20R11 Spark Plugs
    Special Price $66.76 Regular Price $94.99
    DENSO
  9. DENSO Spark Plug
    8 pc DENSO Standard U-Groove 6044 W9EXR-U Spark Plugs
    Special Price $18.95 Regular Price $26.99
    DENSO
  10. DENSO Spark Plug
    DENSO Standard U-Groove 3121 K20PR-U11 Spark Plug
    Special Price $3.32 Regular Price $4.99
    DENSO
  11. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3297 SK20R11 Spark Plugs
    Special Price $51.32 Regular Price $72.99
    DENSO
  12. DENSO Spark Plug
    DENSO Iridium Long Life 3499 SC16HR11 Spark Plug
    Special Price $12.50 Regular Price $17.99
    DENSO
  13. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3473 FK20HBR11 Spark Plugs
    Special Price $103.71 Regular Price $147.99
    DENSO
  14. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3444 SC20HR11 Spark Plugs
    Special Price $48.38 Regular Price $68.99
    DENSO
  15. DENSO Spark Plug
    6 pc DENSO Iridium TT 4704 IKH20TT Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $54.29 Regular Price $77.99
    DENSO
  16. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3297 SK20R11 Spark Plugs
    Special Price $34.51 Regular Price $48.99
    DENSO
  17. DENSO Spark Plug
    8 pc DENSO Double Platinum 5071 TJ14R-P15 Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $56.10 Regular Price $79.99
    DENSO
  18. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3421 SK20HR11 Spark Plugs
    Special Price $36.85 Regular Price $52.99
    DENSO
  19. DENSO Spark Plug
    DENSO Iridium Long Life 3426 FK20HR11 Spark Plug
    Special Price $17.24 Regular Price $24.99
    DENSO
  20. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3324 SK16R11 Spark Plugs
    Special Price $34.51 Regular Price $48.99
    DENSO
  21. DENSO Spark Plug
    DENSO Double Platinum 3127 PK20R8 Spark Plug
    Special Price $7.93 Regular Price $10.99
    DENSO
  22. DENSO Spark Plug
    2 pc DENSO Iridium Power 5379 IWF22 Spark Plugs
    Special Price $17.74 Regular Price $24.99
    DENSO
  23. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3426 FK20HR11 Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $96.99 Regular Price $138.99
    DENSO
  24. DENSO Spark Plug
    6 pc DENSO Iridium TT 4705 IKBH20TT Spark Plugs
    Special Price $72.28 Regular Price $102.99
    DENSO
  25. DENSO Spark Plug
    4 pc DENSO Iridium Racing 5749 IKH01-24 Spark Plugs
    Special Price $146.04 Regular Price $208.99
    DENSO
  26. DENSO Spark Plug
    8 pc DENSO Iridium Long Life Spark Plugs for 2007-2017 Toyota Tundra 4.6L 5.7L V8
    Rating:
    100%
    2  Reviews
    Special Price $89.21 Regular Price $126.99
    DENSO
  27. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3491 FK20HBR8 Spark Plugs
    Special Price $68.90 Regular Price $97.99
    DENSO
  28. DENSO Spark Plug
    6 pc DENSO Iridium Power 5321 IK31 Spark Plugs
    Special Price $87.39 Regular Price $124.99
    DENSO
    Out of stock
  29. DENSO Spark Plug
    6 pc DENSO Iridium Long Life Spark Plugs for 2016-2017 Toyota Tacoma 3.5L V6
    Special Price $121.80 Regular Price $173.99
    DENSO
  30. DENSO Spark Plug
    DENSO Iridium Long Life 3324 SK16R11 Spark Plug
    Special Price $9.29 Regular Price $12.99
    DENSO
  31. DENSO Spark Plug
    4 pc DENSO Iridium Long Life 3426 FK20HR11 Spark Plugs
    Special Price $66.28 Regular Price $94.99
    DENSO
  32. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3417 SK16HR11 Spark Plugs
    Special Price $64.76 Regular Price $92.99
    DENSO
  33. DENSO Spark Plug
    6 pc DENSO Iridium Power 5346 IKH24 Spark Plugs
    Special Price $71.88 Regular Price $102.99
    DENSO
  34. DENSO Spark Plug
    2 pc DENSO Iridium Long Life 3491 FK20HBR8 Spark Plugs
    Special Price $34.88 Regular Price $49.99
    DENSO
  35. DENSO Spark Plug
    2 pc DENSO Iridium TT 4715 ITF16TT Spark Plugs
    Special Price $17.92 Regular Price $25.99
    DENSO
  36. DENSO Spark Plug
    6 pc DENSO Iridium TT Spark Plugs for 2007-2013 Toyota FJ Cruiser 4.0L V6
    Special Price $66.81 Regular Price $94.99
    DENSO
  37. DENSO Spark Plug
    4 pc DENSO Iridium TT 4702 IK20TT Spark Plugs
    Special Price $33.97 Regular Price $48.99
    DENSO
  38. DENSO Spark Plug
    6 pc DENSO Iridium TT 4701 IK16TT Spark Plugs
    Special Price $49.49 Regular Price $70.99
    DENSO
  39. DENSO Spark Plug
    6 pc DENSO Iridium TT 4703 IKH16TT Spark Plugs
    Special Price $54.29 Regular Price $77.99
    DENSO
  40. DENSO Spark Plug
    DENSO Iridium Long Life 3442 FXE22HR11 Spark Plug
    Special Price $18.26 Regular Price $25.99
    DENSO
    Out of stock
  41. DENSO Spark Plug
    6 pc DENSO Iridium Long Life Spark Plugs for 2005-2015 Toyota Tacoma 4.0L V6
    Special Price $68.79 Regular Price $97.99
    DENSO
  42. DENSO Spark Plug
    6 pc DENSO Iridium Long Life 3461 SXU22HCR11S Spark Plugs
    Special Price $87.55 Regular Price $124.99
    DENSO
  43. DENSO Spark Plug
    8 pc DENSO Iridium Power Spark Plugs for 2000-2009 Toyota Tundra 4.7L V8
    Special Price $72.79 Regular Price $103.99
    DENSO
  44. DENSO Spark Plug
    8 pc DENSO Iridium TT Spark Plugs for 2007-2016 Lexus LS460 4.6L V8
    Rating:
    100%
    2  Reviews
    Special Price $112.55 Regular Price $160.99
    DENSO
  45. DENSO Spark Plug
    4 pc DENSO Iridium Power 5309 IXU24 Spark Plugs
    Special Price $35.84 Regular Price $50.99
    DENSO
  46. DENSO Spark Plug
    4 pc DENSO Iridium TT 4704 IKH20TT Spark Plugs
    Special Price $36.48 Regular Price $51.99
    DENSO
  47. DENSO Spark Plug
    6 pc DENSO Standard Spark Plugs for 1995-2004 Toyota Tacoma 3.4L V6
    Special Price $43.21 Regular Price $61.99
    DENSO
  48. DENSO Spark Plug
    6 pc DENSO Iridium Long Life Spark Plugs for 2003-2013 Toyota 4Runner 4.0L V6
    Special Price $68.79 Regular Price $97.99
    DENSO
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The Sixity Auto Advantage

Finding the right car spark plugs can seem complicated, but our goal is to make it simple. We combine a massive selection of parts from trusted brands with the expert, US-based support you need to make the right choice. With fast shipping and a 100% fitment guarantee, we provide a hassle-free shopping experience that has earned the trust of over a million customers.

Platinum, Iridium, and More

Choosing the right material is key to your engine’s performance and longevity. We carry a massive selection of aftermarket spark plugs in every type, from long-lasting iridium to dependable copper plugs for classic vehicles. Whatever your engine needs, we have the right plug to match its specific requirements, ensuring optimal spark and efficiency.

Expert Support When You Need It

Not sure which plug is right for your vehicle? Our friendly, US-based customer support team is here to help. With deep knowledge of our full catalog, they can guide you to the perfect car spark plugs for your specific make and model. We are committed to helping you buy with confidence and getting your installation done right the first time.

Frequently Asked Questions

Got a question about our automotive spark plugs? Here are a few things people often ask. For anything else, our main FAQ page has you covered.

How do I find the right spark plugs for my car?

Your best bet is our vehicle selector tool. Just plug in your car’s info, and we’ll show you exactly which plugs are guaranteed to work.

Are your aftermarket spark plugs as good as the originals?

Definitely. We only carry parts that are as good or better than the ones that came in your car, but without those dealership prices.

How often should I replace car spark plugs?

That really depends on the type. A standard copper plug is usually good for about 20,000 miles, while a high-end iridium one can last 100,000. Your owner’s manual will have the exact schedule for your engine.

Spark Plug Features

  • Precision ceramic insulators
  • Corrosion-resistant shell with triple high pressure gas seals
  • Screw or snap-on electrical connectors
  • Pre-installed metal compression gaskets
  • Copper-core electrode cooling
  • Application specific heat-range design
  • Improved cold-starting performance
  • Smooth firing at high or low engine RPM
  • Reduced electrode erosion and long service life
  • Enhanced ignition efficiency and fuel economy
  • Superior anti-fouling characteristics
  • Reduced hot-spark firing voltage requirements
  • Maximum engine horsepower and torque
  • Superior throttle-response, acceleration and WOT performance
  • Precision Laser-welded Iridium electrodes - 6X harder than platinum
  • Precision ceramic insulators
  • Corrosion-resistant shell with triple high pressure gas seals
  • Screw or snap-on electrical connectors
  • Pre-installed metal compression gaskets
  • Copper-core electrode cooling
  • Application specific heat-range design
  • Improved cold-starting performance
  • Smooth firing at high or low engine RPM
  • Reduced electrode erosion and long service life
  • Enhanced ignition efficiency and fuel economy
  • Superior anti-fouling characteristics
  • Reduced hot-spark firing voltage requirements
  • Maximum engine horsepower and torque
  • Superior throttle-response, acceleration and WOT performance
  • Precision Laser-welded Iridium electrodes - 6X harder than platinum
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100% fitment guarantee at sixityauto.com

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© 2026 Sixity, Inc. Part of Proximity Group, an American-owned and operated online retailer. All Rights Reserved.