U.S. imports of Catalytic Converters and Particulate Filters for Internal Combustion Engines (HS 842132) totaled $352.9M in August 2026, imported from 46 countries.
Importers of Catalytic Converters and Particulate Filters for Internal Combustion Engines paid $8.0M in duties in August 2026, an average duty rate of 2.29% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Catalytic Converters and Particulate Filters for Internal Combustion Engines imports of $352.9M in August 2026 ran 23% above the year-to-date monthly average of $285.8M.
Last updated: August 2026 dataCatalytic converters and diesel particulate filters reduce harmful exhaust emissions from internal combustion engines and are subject to stringent EPA and state-level (particularly California CARB) compliance requirements that govern both OEM and aftermarket products entering US commerce. Mexico and Canada are the leading suppliers, reflecting tightly integrated North American automotive production networks. Goods from Germany and South Korea are also significant, and importers should be aware that aftermarket catalytic converters must meet EPA emissions standards to be legally sold or installed in the US.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
5.1K import shipments a month
Aftermarket catalytic converters imported for sale or installation in the US must comply with EPA regulations under the Clean Air Act, which prohibit the sale of converters that do not meet applicable emission standards. California additionally requires CARB Executive Order certification for vehicles registered in the state. Importers should obtain compliance documentation from the manufacturer before entry.
Under the US schedule, the single 10-digit line 8421320000 is described as 'catalytic converters,' which encompasses both catalytic converters and particulate filters for purifying or filtering exhaust gases from internal combustion engines as defined at the HS6 level. Importers should ensure the commercial invoice description aligns with the specific product type for accurate CBP review.
Subheading 1 of 12 in heading 8421
Subheading 842132 · $352.9M of $1.4B
ImportsExports
Imports
$352.9MYoY · free account
Exports
$118.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $3.3B of Catalytic Converters and Particulate Filters for Internal Combustion Engines and exported $1.2B.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8421320000 | Catalytic Converters | $350.3M | 2.29% | 10.45% | $8.0M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8421320000 | Catalytic Converters | $118.7M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Mexico and Canada together supply 86% of it. Japan pays 13.1% duty; Canada 0.1%.
customs district
destination
entry
rate provision · imports
85.9% enters free of duty; duty collected equals 2.29% of imports for consumption.