VIN & CoC Essentials
Where to Find Your VIN (Chassis Number) and How to Read It
The VIN number (Vehicle Identification Number), also called the chassis number, is the #1 piece of information you need to request a Certificate of Conformity (CoC). This guide shows the most common VIN locations on the car and on documents, explains how a 17-character VIN is structured, and helps you avoid the small errors that cause big delays.
What is a VIN (chassis number)?
The VIN number (Vehicle Identification Number) is a unique identifier assigned to each vehicle. In everyday terms, it’s the car’s serial number. In many countries it’s also called the chassis number.
A standard VIN is 17 characters (letters and numbers). It does not change when the car moves between countries, plates, or owners—so it’s the most reliable way to identify your exact vehicle version.
Quick definition: VIN = the unique 17-character ID used for registration, compliance checks, service history, and CoC requests by VIN.
Why the VIN matters for CoC and EU registration
If you’re requesting an EU Certificate of Conformity (CoC), the VIN is the single most important detail. Why? Because the CoC must match the vehicle’s exact brand, model, variant/version, engine, and EU type approval.
- Fast matching: the VIN links your car to the correct technical record.
- Fewer delays: correct VIN reduces manual verification and back-and-forth.
- Accurate data: CO₂, weights, dimensions, tyres, power, and approval numbers.
Need a CoC? Start with the VIN
If you have the VIN, you can usually start a COC certificate request in minutes and avoid the most common mistakes.
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Where to find the VIN on the car (most common locations)
The VIN can appear in more than one place. Depending on the model, you may see it on a metal plate, a sticker, or stamped into the body. Here are the most common VIN locations:
| VIN location | What it looks like | Quick tip |
|---|---|---|
| Windshield (dashboard) | VIN visible through the glass (usually driver side) | Use daylight; avoid reflections by changing angle |
| Driver door frame / B-pillar | Sticker/plate when the door is open | Take a full-frame photo including the whole label |
| Engine bay | Plate or stamped number near strut tower/firewall | Clean gently; don’t scrape the stamping |
| Under the hood / bonnet | Manufacturer plate or label | Use a flashlight; avoid shadows in photos |
| Chassis stamping (body) | VIN stamped into metal (sometimes under seats or floor area) | If hard to access, use your phone camera with zoom |
Not all cars show the VIN in all locations. If one spot is unreadable, check another—your registration document often has the cleanest VIN reference.
Where to find the VIN on registration documents
If the car is already registered, the VIN is usually printed on the registration certificate (or logbook). This is often the best source for a clean, readable VIN when requesting a CoC by VIN.
| Document | Where the VIN is shown | Why it helps |
|---|---|---|
| Registration certificate | Vehicle identification section (often clearly labeled) | Most reliable for typing/copying the VIN accurately |
| Insurance documents | Vehicle details section (varies by insurer) | Good backup reference if registration paper is missing |
| Purchase invoice / contract | Vehicle identification lines (sometimes) | Useful if car is newly purchased and not yet registered |
| Service book / maintenance records | Vehicle details page (not always) | Another cross-check if you suspect a VIN typo |
Practical tip: If you’re typing the VIN, compare the paper VIN with a VIN photo from the car. When both match, you’re safe.
How to read a VIN (17 characters explained)
You don’t need to decode every character to request a CoC, but understanding the basics helps you spot mistakes. A VIN is typically divided into three parts:
| Section | Position | What it indicates |
|---|---|---|
| WMI | 1–3 | World Manufacturer Identifier (manufacturer / region) |
| VDS | 4–9 | Vehicle Descriptor (model/series/body/engine related info) |
| VIS | 10–17 | Vehicle Identifier (model year/plant/serial sequence) |
For a Certificate of Conformity request, the key is that the VIN identifies your exact vehicle configuration. Registration offices use it to link the car to the correct EU approval and technical data.
Common VIN mistakes (0/O, 1/I) and how to avoid them
Most VIN problems are not “complex”. They’re small visual errors—especially when people type from a blurry photo. Here are the most common VIN mistakes and the fastest fixes:
| Mistake | What happens | Best fix |
|---|---|---|
| 0 (zero) vs O (letter) | VIN mismatch → record not found / wrong match | Use the VIN from the registration document and cross-check |
| 1 (one) vs I (letter) | Incorrect VIN entered into the form | Zoom in, verify character-by-character before submitting |
| Blurred VIN photo | Manual review needed → delays | Retake with good light, no reflections, full frame |
| Missing one character | VIN becomes invalid (not 17 characters) | Count characters; copy/paste where possible |
| Using plate number instead of VIN | Plate can change; not a reliable ID | Always provide the VIN for a CoC request |
Important: If your VIN is not 17 characters, stop and double-check. A standard VIN for passenger vehicles is typically 17 characters. If your document shows something different, it may be a special case (older vehicle, non-standard record, or paperwork issue).
VIN photo/scanning checklist (for a fast CoC approval)
If you’re uploading a VIN photo or registration document for a COC certificate request, these small details make a real difference:
- Full frame: capture the whole VIN label/plate or the whole document page.
- No glare: tilt the phone slightly, avoid flash reflections on windshield VINs.
- Sharp focus: tap-to-focus on the VIN characters.
- Good lighting: daylight works best; avoid shadows.
- One clean file: don’t compress it too much; keep text readable.
Ready to request your CoC?
If you’ve found the VIN, you’re already 80% done. Submit it once, correctly, and your process stays smooth.
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FAQ: VIN number / chassis number
Is the VIN the same as the chassis number?
In most contexts, yes. Many people use “chassis number” to refer to the VIN number. The VIN is the standardized 17-character identifier used for registration and compliance.
Can I request a CoC with only a license plate?
Usually, the VIN is required because plates can change between countries and registrations. The VIN is the reliable identifier for a Certificate of Conformity request.
What if the VIN plate is missing or unreadable?
Check your registration document first. If you still can’t confirm the VIN, contact support before submitting a request. An incorrect VIN will delay everything.
How many characters is a VIN?
A standard VIN is 17 characters. If the number you have is shorter or formatted differently, you may have a special case (older vehicle, non-standard paperwork, or regional record differences).
Do I need to decode the VIN to request a CoC?
No. You simply need the correct VIN. Decoding can help you spot obvious errors, but the request is matched using the VIN itself.
Found your VIN? That’s the key.
Start your Stellantis CoC request with the VIN and avoid the delays caused by typos or unreadable scans.
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