Purolator A21387 PurolatorONE Advanced Engine Air Filter

The A21387 is a single-use multi-fiber panel filter with a molded frame and steel grid backing that drops into the factory air box of the 2.4L K24W engine, replacing Honda OEM part 172205PHA00 (17220-5PH-A00). That cross-reference does not appear on the Purolator-brand Amazon listing itself, but is confirmed independently on carparts.com's own interchange table and on sixityauto.com's own fitment table for this exact SKU. Purolator's own listing states the filter traps up to 99% of dirt, soot, and debris "based on ISO 5011 on A24278," an explicit disclosure that the test was run on a different filter in the same PurolatorONE Advanced line rather than on the A21387 itself, so treat the figure as manufacturer-published rather than independently confirmed for this specific product. Purolator recommends replacement every 12 months or 12,000 miles; Honda's own factory Maintenance Minder schedule for the CR-V's 2.4L engine permits up to 30,000 miles. The listing also claims the filter "can improve acceleration by up to 11%," citing a real U.S. Department of Energy study; that study measured replacing a clogged filter with a clean one, not one new filter brand against another, so it doesn't support a brand-vs-brand acceleration claim.

Right pick for an owner whose vehicle uses the 2.4L K24W engine (confirmed against Honda OEM part 17220-5PH-A00) who wants the lowest verified price in this catalog for that exact OE cross, sold and shipped directly by Amazon. The independent retailer cross-reference chain, backed by HondaPartsNow's own genuine-parts dealer page for the OE part, makes fitment risk low for this exact engine. Skip if your vehicle uses a different engine: other variants of the same model years use a different OEM air-filter part number, so the A21387 does not fit them. Also skip if you want a filter with independently verified filtration data for this exact SKU rather than a manufacturer claim tested on a sibling part number, or if you'd rather have a washable, reusable filter; a K&N 33-5063 and a WIX WA10675 both cross to the same OEM part number elsewhere in this catalog.

Passive replacement component; no chemical exposure pathway during installation or removal, and no SDS applies. The live Amazon listing for this ASIN carries a posted California Proposition 65 warning, reflected as a small accessory health adjustment rather than a use-phase exposure hazard. The environment score of 4 reflects the standard disposable lifecycle: this filter generates one physical waste unit at each replacement cycle, with composite multi-fiber-media and molded-frame construction limiting municipal recyclability, typical for the disposable category.

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