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Decent.
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Prices may varyThis product ranks #27 of 32 in Spark Plug.Three above it ↓
Last reviewed August 13, 2026
TL;DR Aftermarket double-iridium plug for Honda and Acura: iridium on both electrodes, factory-gapped at 1.1mm. Heat range is not disclosed, and there is a heat-range-mismatch complaint on a listed Honda Accord 2.4 (plugs running colder than the originals).
Laser-welded iridium center electrode and iridium ground inlay; nickel-plated rolled threads; factory gap set at 1.1mm. Bosch is the OE supplier for VAG and BMW engines; these Honda and Acura applications are aftermarket cross-references, not OE-confirmed fitment. No mileage interval is stated. The manufacturer does not publish the heat range for part number 9619, an unusual omission for a premium plug. Owner feedback is generally good, but on a listed Accord 2.4 owners have reported the plugs running colder than originals, consistent with a heat-range mismatch.
Honda and Acura owners wanting double-iridium metallurgy who accept aftermarket fitment. Skip if heat-range verification matters; Bosch does not publish it for part number 9619.
No chemical exposure from the plug in use, but the listing carries a California Proposition 65 warning, and that warning is scored as a health deduction here. No interval is stated, so consumption benefit over copper alternatives is unknown. Steel shell is recyclable; alumina-ceramic insulator goes to landfill.
The Amazon listing for Bosch 9619 OE Fine Wire Double Iridium Spark Plug carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, Bosch 9619 OE Fine Wire Double Iridium Spark Plug has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Bosch, via Amazon. Not editorial.
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