Which Imported Auto Parts Must Meet FMVSS (DOT) Rules?

Short answer: in the US, an item of replacement motor vehicle equipment only has to meet a Federal Motor Vehicle Safety Standard (FMVSS) if a standard specifically applies to that equipment. For the categories most buyers import from China, the standards that matter are FMVSS 106 (brake hoses), FMVSS 108 (lamps, reflective devices and associated equipment), FMVSS 116 (brake fluids), FMVSS 205 (glazing) and the tire standards (for example FMVSS 139). Parts such as control arms, filters, rotors and sensors have no equipment standard of their own — but they are still motor vehicle equipment, so the defect and noncompliance reporting rules in 49 CFR Part 573 and the foreign-manufacturer agent rule in Part 551 still apply.

The standards are published in Title 49 of the Code of Federal Regulations, Part 571. The quotes below are taken from the current eCFR text.

Which FMVSS standards apply to replacement parts?

Part 571 contains dozens of standards, but most of them set requirements for complete vehicles (crash protection, controls and displays, brake system performance). Only some regulate equipment sold on its own. The ones that touch categories in the PartzealHQ catalog:

• FMVSS 106 — Brake hoses. It "specifies labeling and performance requirements for motor vehicle brake hose, brake hose assemblies, and brake hose end fittings", for hydraulic, air and vacuum brake hose. Categories: brake hoses, brake lines.
• FMVSS 108 — Lamps, reflective devices, and associated equipment. It covers "original and replacement lamps, reflective devices, and associated equipment". Categories: headlights, tail lights, fog lights.
• FMVSS 116 — Motor vehicle brake fluids. It "specifies requirements for fluids for use in hydraulic brake systems of motor vehicles, containers for these fluids, and labeling of the containers."
• FMVSS 205 — Glazing materials. Applies to windshields and window glass.
• Tire standards — for example FMVSS 139 for new pneumatic radial tires for light vehicles.

Note what is not on the list: FMVSS 105 and 135 set brake system performance for vehicles. There is no FMVSS that a replacement brake pad or rotor must be certified to on its own.

What does the "DOT" marking mean on a part?

The DOT symbol is a certification made by the manufacturer itself — FMVSS 106 calls it "a certification by the hose manufacturer", and FMVSS 108 ties the headlamp marking to certification under 49 U.S.C. 30115. It is not a mark issued by a government test lab.

• Brake hose (FMVSS 106, S5.2.2). Each hydraulic brake hose must be labeled, at intervals of not more than 6 inches, in block capital letters at least one-eighth of an inch high, with — among other items — "the symbol DOT, constituting a certification by the hose manufacturer that the hose conforms to all applicable motor vehicle safety standards", and a designation identifying the hose manufacturer, which must be filed in writing with NHTSA's Office of Vehicle Safety Compliance.
• Headlamps (FMVSS 108, S6.5.1). "The lens of each original equipment and replacement headlamp ... must be marked with the symbol 'DOT' either horizontally or vertically to indicate certification under 49 U.S.C. 30115." For other lamps and reflective devices in the standard's Table I, the standard says they may be marked with DOT — so a tail light without the marking is not automatically non-compliant, but a headlamp without it is.
• Brake fluid (FMVSS 116) sets labeling requirements for the fluid container, not just the fluid.

A DOT marking printed by a factory is a claim, not proof. Ask for the test report behind it (see below).

What extra obligations does a foreign manufacturer have?

Three procedural rules in Title 49 matter when the maker is outside the US, and they are not limited to FMVSS-regulated parts:

• Agent for service of process (49 CFR Part 551, Subpart D). Its stated purpose is "to establish a procedure for foreign manufacturers, assemblers and importers of motor vehicles and motor vehicle equipment to designate an agent in the United States on whom service of administrative or judicial notices or processes may be made." Section 551.46 says all foreign manufacturers, assemblers and importers of motor vehicle equipment must comply "before offering a motor vehicle or item of motor vehicle equipment for importation into the United States", and that until an agent is appointed the foreign manufacturer "may not import" vehicles or equipment into the US.
• Defect and noncompliance reports (49 CFR Part 573). Part 573 applies to manufacturers of "motor vehicle original and replacement equipment". For imported equipment, compliance with the notification requirements by either the fabricating manufacturer or the importer counts as compliance by both; for replacement equipment other than tires, compliance by the brand name or trademark owner counts as compliance by the manufacturer. If you sell under your own brand, plan for that role.
• Manufacturer identification (49 CFR Part 566). Its purpose is "to facilitate the regulation of manufacturers under the National Traffic and Motor Vehicle Safety Act, and to aid in establishing a code numbering system for all regulated manufacturers."

If a factory cannot tell you whether it has filed these, treat that as information about how much US business it really does.

What should I ask a Chinese factory before importing regulated equipment?

For brake hoses, lamps and brake fluid, ask for these before you approve a sample:

1. The test report against the specific FMVSS (106, 108 or 116), the laboratory that ran it, the date, and the exact part number tested.
2. The manufacturer designation used in the brake hose marking, and confirmation it has been filed with NHTSA.
3. The name of its US agent for service of process under Part 551.
4. Photos of the marking on production parts, not renderings — the DOT symbol on the headlamp lens, the legend along the brake hose.
5. Who carries recall responsibility in your contract, and how traceability works (batch or date codes on the part and the carton).

European approvals such as ECE R90 (brake friction) or E-marked lamps are a different system; an E-mark does not certify a lamp to FMVSS 108. See ECE R90 brake friction homologation explained.

Does PartzealHQ check FMVSS compliance?

No. PartzealHQ lists factories and part numbers compiled from public B2B marketplace listings, as described on the methodology page. We have not tested any part or checked any certificate. Supplier listings show what each company says about itself; for regulated equipment, the documents above are the evidence to ask for.

Sources

• 49 CFR 571.106, Standard No. 106, Brake hoses (S1 Scope; S5.2.2 labeling) — eCFR, current text retrieved November 2026, ecfr.gov.
• 49 CFR 571.108, Standard No. 108, Lamps, reflective devices, and associated equipment (S1; S6.5.1 DOT marking) — ecfr.gov.
• 49 CFR 571.116, Standard No. 116, Motor vehicle brake fluids (S1 Scope) — ecfr.gov.
• 49 CFR Part 571 table of standards (105, 135, 139, 205) — ecfr.gov.
• 49 CFR 551.45 and 551.46 (agent for service of process) — ecfr.gov.
• 49 CFR 573.3 (application of defect and noncompliance reporting) — ecfr.gov.
• 49 CFR 566.2 (manufacturer identification) — ecfr.gov.

This guide is general information, not legal advice. Talk to a US regulatory consultant before importing regulated equipment.