Automotive · updated November 2026
Lost Your Only Car Key?
What to do first, whether to call a locksmith or the dealer, what proof you need and what it costs.
Short answer
If you lost your only car key, gather your ID and registration or title, note the year, make, model and VIN, and call a mobile automotive locksmith or your dealer. Many vehicles can have a new key cut and programmed where they are parked, an estimated $150–$400+. Some newer models need the dealer.
What to do first
- Retrace your steps and call places you visited recently
- Check whether anyone has a spare, at home or with family
- Find your photo ID and the vehicle registration or title
- Note the year, make, model and VIN (on the registration or the dashboard through the windshield)
- Check your insurance or roadside plan for key replacement coverage
- Call a mobile locksmith or your dealer with those details
Is a locksmith or the dealer better for a lost car key?
| Mobile locksmith | Dealer | |
|---|---|---|
| Where the key is made | Where the car is parked | At the dealership |
| Tow needed when no key works | No | Often |
| Vehicles covered | Many makes and models | All models of their brand |
| Newest or some European models | Sometimes not possible | Yes |
| Proof of ownership | Required | Required |
Compare the total cost: the dealer price plus any tow, against the locksmith price. Ask both whether programming is included.
What type of key do you need?
| Key type | Replacement involves |
|---|---|
| Standard metal key (older vehicles) | Cutting only |
| Transponder (chip) key | Cutting and chip programming |
| High-security laser-cut key | Special cutting and programming |
| Remote head or flip key | Cutting, chip and remote programming |
| Smart key (push-to-start) | Programming; some models dealer-only |
Car key replacement and programming is an estimated $150–$400+. Smart keys are at the top of the range. These are estimated market ranges, not confirmed prices.
What proof of ownership do you need?
Any honest locksmith or dealer will ask for a photo ID and the vehicle registration or title in your name before making a key. If those documents are locked in the car, the car can be opened first and the documents checked before the key is made.
If the vehicle is registered to someone else, such as a family member or an employer, bring written authorization or have the owner present.
Can you use a key bought online?
Sometimes. Keys and fobs sold online often look identical to the original but carry the wrong chip, or are used keys already locked to another vehicle that cannot be reprogrammed. Blades may also be the wrong profile.
If you buy one, ask the locksmith or dealer before you order whether they will program it, and expect to pay for programming time even if the key turns out to be unusable. A key supplied by the locksmith is matched to your vehicle.
Lost a key, or lost a fob?
On many vehicles the remote and the key are separate: a metal or chip key starts the car and a remote locks the doors. If you lost only the remote, you may still be able to drive while a replacement is programmed.
On push-to-start cars, the fob is the key. Losing it means the car cannot be started, and a replacement must be programmed to the car before it will run.
What if the keys were stolen?
- Report the theft to the police
- Ask the locksmith or dealer whether the lost keys can be removed from the car’s memory when the new key is programmed
- If house keys were on the same ring, rekey your house locks the same day
- Tell your insurer if the policy covers keys or theft
How to avoid this next time
Get a spare key made while you still have one that works. Adding a key is usually simpler and cheaper than replacing all lost keys, because the working key can be used during programming. Keep the spare at home, not in the car.
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Lost your car key?
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