Where to Find the Car Key Number?

From a locksmith’s perspective: the key number is often stamped on the original key blade or fob. If missing, a professional locksmith can decode it from the lock cylinder or ignition barrel. For modern cars with transponder keys (e.g., BMW iX), dealerships or specialised auto-locksmiths can extract the code from the car’s ECU using diagnostic tools. Always verify credentials before sharing ownership documents.

The car key number is typically found in several locations, depending on the vehicle manufacturer and model. The most common places to locate it include the original key fob, the vehicle’s logbook (V5C document), or the dealership’s records if the car was purchased new. Some manufacturers also stamp the key number on a metal tag provided at purchase.

For older models, check inside the glovebox or owner’s manual for a small plastic or metal tag with the code. Modern cars like the Ford Focus or Vauxhall Corsa may store the key number electronically, accessible via the dealership or a locksmith with proper credentials.

If the key is lost, contact your car’s manufacturer or a certified locksmith with proof of ownership (V5C and ID). They can retrieve the key code from the vehicle’s immobiliser system or central database. Avoid third-party sellers claiming to provide key numbers without verification, as this poses security risks.

To prevent future issues, note the key number separately in a secure place, such as a home safe or digital password manager. Never store it inside the car.

"VIN" stands for Vehicle Identification Number, known in Chinese as "车辆识别代码" (chēliàng shíbié dàimǎ). It is a unique 17-character alphanumeric code used to identify vehicles, often referred to as a car's identity card. Some also call it the 17-digit identification code, chassis number, or 17-digit serial number.

The VIN can typically be found in the following locations:

1. Lower left side of the dashboard;
2. Lower left corner of the windscreen;
3. On the vehicle's identification plate;
4. Upper section of the right front shock absorber on the body;
5. In the boot area;
6. On the door hinge pillar, door lock pillar, or one of the door edges adjoining the lock pillar;
7. On the vehicle registration document (V5C), where modern versions usually print the VIN under the "chassis number" field.

Method:

Most car key fobs feature a small metal tag or plastic strip with a scratch-off coating revealing a security code used by manufacturers for key duplication.

You may visit a dealership, where staff can use the VIN (visible on the windscreen) to retrieve the key code from their system and place an order with the factory.

Summary:

1. Standard car keys often have a metal tag or plastic strip attached.
2. The key's tooth pattern ("齿形号") can be replicated to produce a physical copy matching the original.
3. To enable engine start, electronic immobiliser synchronisation via diagnostic tools remains necessary.
4. While a duplicated key may mechanically operate doors, it cannot start the vehicle without proper electronic pairing. Depending on the model, dealerships require the 17-digit security code from the owner. After verification, they may supply a metal key blank. Alternatively, the vehicle's ECU can be reprogrammed to deactivate lost keys – these will retain door access but fail ignition authorisation.