Denso PK20TT Platinum TT Spark Plug
Priced as of May 27, 2026
4.7(4,350 ratings)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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CarCareTruth's Analysis
Last reviewed May 27, 2026
TL;DR Denso OE supplier for Honda, Toyota, and Mazda; the PK20TT uses a platinum alloy center electrode (1.1mm tip) with a titanium-enhanced alloy ground. Service interval not stated; check the gap out-of-box.
What it is and how it performs
The PK20TT uses a 1.1mm platinum alloy center electrode with a titanium-enhanced alloy ground, thread size 14mm × 1.25, heat range Denso 20 (inferred from the part number, not confirmed on the product page). Denso is an OE ignition supplier for Honda, Toyota, Mazda, and Subaru; OEM cross-references extend to BMW, VW, and Mitsubishi. Community confirms correct fitment on Honda Accord applications; no heat-range mismatch or construction failure reports appear in the review sample. One buyer reports two of six plugs needed gap adjustment out-of-box.
Who should buy this — and who should skip it
Right pick for Honda, Toyota, or Mazda owners whose engine calls for a platinum plug at the Denso 20 heat range (verify via the OEM service manual). Skip if your engine requires double-platinum or iridium, or if a stated mileage rating matters to you.
Safety and environmental impact
No chemical exposure pathway; this is a passive ignition-system part with no SDS. The platinum alloy tip carries a small precious-metal mass; the steel shell is recyclable as ferrous scrap, and the alumina-ceramic insulator goes to landfill via standard disposal.
From the manufacturer
Marketing copy from Denso, via Amazon. Not editorial.
- •DENSOs revolutionary Twin-Tip design is a combination of highly durable precious metals-Platinum and Titanium.
- •The center electrode is created using an extremely durable platinum alloy that allows for the reduction of the tip size to 1.1mm in diameter, while maintaining the life of the plug.
- •The Titanium-enhanced alloy on the ground electrode also increases durability, which is critical to minimize tip erosion and achieve the new Twin-Tip design
- •Superior ignitability of the DENSO Platinum TT means more efficient combustion, which yields better engine performance in terms of power and fuel economy.
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Manufacturer specifications
- Brand
- Denso
- Core Material
- Platinum
- Thread Size
- 14mm (1.25mm)
- Top Material Type
- Ceramic
- Vehicle Service Type
- Car, Truck
- Brand Name
- Denso
- Manufacturer Part Number
- 4504
- UPC
- 026521134574
- OEM Equivalent Part Number
- 0000-18-KJ13, 101 905 631 B, 101 905 631 H, 101 905 640, 101 905 640 A, 12 12 0 032 134, 12 12 0 032 135, 12 12 9 069 877, 1822A069, 18823-11091, 19302724
- Model Number
- PK20TT
- Unit Count
- 1.0 Count
- Manufacturer Warranty Description
- Includes manufacturer provided warranty
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Good Quality & Value
After purchasing these spark plugs and changing out the originals in my vehicle, I have had good results and have experienced no problems thus far after several months of having these plugs installed. As stated by the Amazon vehicle information tool, these plugs have been a perfect fit for my vehicle. After doing some research before my purchase, I believe these spark plugs should last for a long time and I would recommend these to anyone whose vehicle these are a match.