Start with the vehicle information
When the last working car key disappears, the first useful step is to identify the vehicle accurately. A locksmith needs more than the make and the fact that the key is missing.
Have the year, make and model ready. Tell the dispatcher whether the vehicle uses a metal key, a chip key, a remote head key or push-button start. If you are uncertain, describe how you normally start the vehicle.
The vehicle identification number, or VIN, helps confirm the correct key application. You can find it at the base of the windshield on the dashboard or on the registration.
Also give the vehicle’s location. Cairn provides mobile automotive service at homes, workplaces and parking lots throughout its service area, so supported key replacement work can be completed at the vehicle without arranging a tow.
How an all-keys-lost job differs
Making a spare is a different job from replacing the only missing key. When a working key exists, a technician can duplicate it and add another programmed key to the vehicle.
When none remains, the technician must originate a replacement key using the vehicle’s key information or the existing lock. The vehicle’s computer must then be programmed to recognize the replacement without a working key available as a starting point.
This requires additional work and equipment. Most vehicles built since the late 1990s use a transponder chip that must be recognized before the engine will start.
A replacement blade that turns a mechanical lock is not necessarily enough to start the car. The programming stage matters just as much as producing the correct physical key.
Cairn’s mobile vans carry automotive key cutting and programming equipment. Whether a particular vehicle can be completed on site is confirmed from its details before dispatch.
Have your ownership documents ready
Before making a replacement key, the locksmith checks authorization. This protects owners and makes the service record clear.
Have the following information and documents ready:
- Vehicle year, make and model.
- VIN from the vehicle or registration.
- Photo identification.
- Registration, title or insurance card in the same name.
- The vehicle’s location and usual starting method.
If the ownership documents are locked inside the vehicle, tell the dispatcher. The technician checks them once the vehicle is open.
Do not send copies of identification or vehicle security information through the website. Ownership documents are reviewed by the technician as part of the service.
Understand the price and vehicle limits
Cairn’s standard car key cutting and programming starts from $120. Smart keys and proximity fobs start from $220. The $39 service call fee is separate from those starting prices.
The total depends on the vehicle’s year, make, model, key technology and whether all working keys are missing. The technician inspects the job and presents a written price for approval before starting work.
Not every vehicle supports independent mobile programming. Cairn works on most domestic and Asian makes from 1998 onward. Many European vehicles from 2015 onward, including certain BMW, Mercedes-Benz, Audi, Volkswagen, Volvo and Land Rover models, require dealer-only programming.
The dispatcher checks those limits from the vehicle details before sending a van. A vehicle requiring dealer equipment should be identified before you incur an unnecessary service visit.
Make the next key while one works
Once the replacement has been cut and programmed, test its operation with the technician. Check that it operates the vehicle as intended before the service is completed.
Consider having a second key made during that visit. Producing a spare while a programmed key is available is less involved than returning to an all-keys-lost situation.
Cairn offers $25 off a second key or fob cut and programmed at the same appointment as the first. The offer runs through December 31, 2026, cannot be combined with another offer and must be mentioned when booking.
Keep the spare somewhere separate from the vehicle and your everyday key ring. That gives you another working key without repeating the full replacement process.