How to verify a Chinese auto parts factory before you order

Most sourcing guides tell you to “visit the factory”. That is good advice if you can fly to Jiangsu, and useless if you are buying from Nairobi, Jeddah or Bogotá. The practical alternative is a structured verification: documents checked against issuing bodies, a live video call that shows the machines rather than the reception area, and references you can call.

This is the checklist we are comfortable being held to, and the one we recommend applying to any Chinese supplier — including us. It is not a substitute for a third-party audit on a large order, but it removes most of the risk on a first container.

1. Start with the legal entity

Ask for the business licence and read it, not just for the name:

• Legal name and unified social credit code. Compare it with the bank account name on the proforma invoice. A mismatch between the company you are paying and the company on the contract is a red flag.
• Established date and registered capital. A factory founded decades ago with a stable capital base is a different risk profile from a two-year-old trading company.
• Business scope. It should include manufacturing of the products you are buying. “Trading” in the scope is not automatically bad — many legitimate suppliers have both — but you should know which you are dealing with.
• Address. Compare it with the address on the certificates and the factory video. Registers can be checked through public Chinese business-information services; your sourcing agent or bank can help.

Dongzhan’s registered entity is Dongzhan Auto Parts Co., Ltd., in Changzhou, Jiangsu — the same site we invite buyers to visit through the factory page.

2. Verify certifications at the issuing body

Certificates are the easiest document to fake and the easiest to verify.

• ISO 9001 and quality system documentation. Ask for the certificate number and the certification body, then check the body’s public register. IATF certificates are searchable through the IATF database; the scope must cover the products and the site.
• E-MARK. Ask for the approval number, the regulation, the holder and the part numbers in scope, then compare with the E-number on the lens. Selected lamp families carry E-MARK documentation approval; scope is available on request.
• Other schemes. SABER, EAC, CCC and similar schemes are usually raised per product or per shipment in the destination market, so a factory “certificate” for them is not the same thing as the scheme itself. The E-MARK vs DOT vs CCC guide explains the difference.

A supplier who can produce the certificate, the annex and the number quickly is a supplier who works with them regularly. One who sends a logo image is not.

3. The video call: make it a walk, not a slideshow

A scheduled video call can be staged. A useful one has constraints: live, unedited, with your questions asked during the walk.

• Shop floor. Ask for a continuous walk from the entrance through production to the warehouse. If the call can only show one room, ask why.
• Mold shop. If the supplier claims OEM/ODM and in-house tooling, ask to see the mold shop, the CNC machines and a mold being worked on. A supplier that develops moulds can show the tooling area; a trader cannot.
• Injection and pressing. Ask for the machine tonnage range and a part being produced. For steel panels, ask to see the press line and the jig fixtures.
• Assembly and testing. Ask for the QC lab: photometric testing for lamps, vibration table, IP water test, temperature chamber, spectral analyser for material composition. A real testing room has equipment with visible wear.
• Warehouse and packing. Ask to see cartons being packed, labelled and stacked — this is where packing claims are prevented.
• A product you are considering. Ask them to pick the actual SKU from stock and show the label, the connector and the packing carton during the call.

The quality page describes the inspection flow we run, and the OEM/ODM page explains what in-house tooling means in practice.

4. Test the engineering response

Send a technical question and judge the answer, not the speed:

• Ask what changes between two model years of the same part — a real factory knows the generation split and the connector difference.
• Ask for the material grade and the surface treatment: DC04 steel and E-coat, PP or ABS, PC lens. Vague answers mean the spec is not controlled.
• Ask for the failure modes the part is tested for — water ingress, vibration, UV, temperature.
• Ask what happens when a batch fails QC: the answer should describe a containment and a corrective action, not a discount.

The sourcing checklist article goes deeper into MOQ, sample and QC mechanics.

5. Check references and history

• Ask for two or three distributor references in your region — not the largest customers in the world, but buyers like you.
• Ask which markets the supplier currently ships to and who prepares the documents for each destination. Request a sample document set for your market and verify the scope with your broker.
• Ask for the last three shipments to your country: destination port, product mix and any conformity scheme used. A supplier who ships regularly to your market knows the documents.
• Ask for a sample from the current production batch, not a “golden sample” kept for buyers. Fit it, photograph it, compare it with the production carton.

6. Red flags that end the conversation

• Cannot show a continuous shop-floor walk, or the “factory” is a single office.
• Certification numbers that do not match the issuing body register, or a scope that does not cover the product.
• Claims OEM/ODM and mould development but has no mold shop.
• Refuses a live video call, or only offers edited videos.
• Asks for payment to a personal account, or a bank account whose name differs from the contract entity.
• No test reports, no material certificates, no QC records.
• Prices far below the market with no explanation of material or process.
• No references, or references that are all in a different business.

None of these is proof of fraud on its own — but each one is a question that should be answered before a deposit, not after.

7. What a good first order looks like

A supplier worth a long-term relationship will support a small first order: a sample, a mixed container or an LCL shipment, and a written QC standard. Our free sample process exists for this reason, and the catalogue gives you the fitment and packing data to plan the first mix.

Verify the factory, then verify the part: a good audit cannot fix a wrong fitment. Send the platform, generation and quantity to start an RFQ — you will get a named contact, a quote with the fitment confirmed, and the documents your market requires.

If a visit or a live video walk-through is the next step, the factory visit agenda gives the one-day schedule, ten floor questions and the 48-hour follow-up that turns the visit into evidence.

FAQ

What documents prove a supplier is a real factory? Ask for the business licence and registration details, the company name on the invoice and bank account, and records from a recent production batch. Names should match across documents. A supplier that cannot align company identity and paperwork is a risk regardless of the product.

What should a video walk-through show? The production line, the packing area, the inspection records and the actual sample you are buying. Ask to see the part measured or fitted against a reference, not just displayed. A walk-through that only shows a showroom tells you little about the batch that will ship.

Which references are worth asking for? Two or three buyers in a comparable market, with permission to contact them. Prepare three questions: what the defect rate was, whether shipments arrived on time, and how claims were handled. An anonymised order record is a fallback if names cannot be shared.

What red flags should stop an order? No inspection records with dates, an invoice issued by a different company than the bank account, evasive answers about generation fitment, and a lighting approval claim with no scope letter naming your part numbers. Pause rather than pay the deposit and hope.