Each part in a mixed shipment must be classified individually under its own HTS heading based on its material composition and function. Grouping dissimilar parts under a single 'catch-all' heading is a common misclassification risk. A licensed customs broker should review the bill of materials for any mixed automotive parts shipment to assign correct tariff lines and identify applicable trade remedy exposure.

Wiring harnesses for motor vehicles sourced from China have been subject to Section 301 tariff actions. The specific tariff list and rate applicable depend on the HTS classification of the harness. Importers should verify the current Section 301 status for their specific product code and consider whether alternative sourcing countries—such as Mexico under USMCA—offer a more favorable duty outcome.