Denso SK20HR11 Iridium Long Life Spark Plug
Priced as of May 27, 2026
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CarCareTruth's Analysis
Last reviewed May 27, 2026
TL;DR Denso is Toyota's OE plug supplier; this part (Toyota 90919-01191) uses a 0.7mm iridium center electrode with platinum ground, rated 100,000 miles, with community-confirmed gap integrity at that interval.
What it is and how it performs
The SK20HR11 uses a 0.7mm iridium center electrode (360° laser-welded) and a platinum-tipped ground. Denso supplies this plug to Toyota as OEM part 90919-01191. Rated 100,000 miles; a verified buyer confirms gap maintained at that interval, with a third change at 300,000 miles on a Toyota V6. Factory gap 1.1mm (0.043"), pre-set confirmed by multiple Tacoma reviews. Fitment covers Toyota (Tacoma 2005–2015, Tundra, 4Runner, Sequoia), Lexus, BMW, Honda, Porsche, and Volvo across 65+ application lines. One reviewer disputes 2006 Volvo S60 fitment; verify before ordering.
Who should buy this — and who should skip it
Right pick for 2005–2015 Tacoma and Toyota/Lexus applications OEM-specified for this plug. OE-confirmed cross-reference, gap ships pre-set. Skip for 2006 Volvo S60; one community report disputes fitment for that engine, warranting a check against the Volvo-specific part number.
Safety and environmental impact
No chemical exposure: passive ceramic-and-steel part, no SDS. Iridium and platinum tips carry trace PGM content, offset by the 100,000-mile interval. Steel shell is recyclable as ferrous scrap; alumina-ceramic insulator goes to landfill.
Frequently asked questions
Is the Denso SK20HR11 the same as Toyota OEM part 90919-01191?▾
Yes. Denso is Toyota's OEM spark plug supplier, and Denso part 3421 (SK20HR11) is the same plug Toyota sells through its dealer parts channel as part number 90919-01191. The Rainforest API product data for this ASIN explicitly lists Toyota 90919-01191 and Toyota 90048-51185 in the OEM Equivalent Part Number field.
Does the Denso SK20HR11 come pre-gapped?▾
Yes. The factory gap is 1.1mm (0.043 inches), and multiple Amazon verified purchasers confirm the plugs arrive pre-gapped to spec for Toyota Tacoma applications — no adjustment required for the standard Toyota NA application.
What is the service interval for the Denso SK20HR11?▾
Denso rates the SK20HR11 for 100,000 miles. One Amazon verified buyer confirms the plugs maintained their original gap through 100,000 miles on a Toyota engine and describes a third plug change at 300,000 total miles — consistent with the manufacturer's rated interval.
Does this plug fit the Toyota Tacoma?▾
The Amazon fitment listing explicitly includes 2005–2015 Toyota Tacoma. The 4-cylinder 2TR-FE and V6 1GR-FE engine families used in 2nd-gen Tacomas are both listed. Multiple Tacoma-specific Amazon reviews confirm correct fit and running-condition improvement. This plug is the OEM specification for this application.
From the manufacturer
Marketing copy from Denso, via Amazon. Not editorial.
- •Single Plug
- •Denso # 3421
- •Extra Long Life Iridium Plug
- •0.7mm Fine Wire Iridium-Tipped Center Electrode
- •Platinum Tipped Ground Electrode
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Manufacturer images
Manufacturer specifications
- Brand
- Denso
- Core Material
- Copper
- Thread Size
- 14 mm
- Top Material Type
- Iridium
- Vehicle Service Type
- Car, SUV, Truck
- Brand Name
- Denso
- Manufacturer Part Number
- SK20HR11
- Global Trade Identification Number
- 00042511034211
- UPC
- 042511034211
- OEM Equivalent Part Number
- DAIHATSU 90048-51185-000, DAIHATSU 90919-01191-000, LEXUS 90919-01191, TOYOTA 90048-51185, TOYOTA 90919-01191
- Model Number
- 3421 (SK20HR11)
- Unit Count
- 1.0 Count
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Good quality spark plugs!
Improves gas mileage with smooth acceleration, easy installation and fits well, very durable original product, excellent price.