All Car Keys Lost? What Happens Next (2026 Guide)
Table of Contents
Immediate Steps to Take When All Car Keys Are Lost
Check Your Insurance and Breakdown Cover First
How an Auto Locksmith Handles Lost Car Keys
What Happens to Your Car's Security System
Car Key Replacement Cost: What Affects the Price
Auto Locksmith vs Dealership: Which Should You Call?
How Long Does It Take to Replace Car Keys?
Do I Need My VIN to Get a New Car Key?
Conclusion
Frequently Asked Questions
Last Updated: September 24, 2026
Immediate Steps to Take When All Car Keys Are Lost
Losing every key to your car feels like a disaster, but it is a problem with a clear fix. If all car keys are lost, stay calm, confirm the car is secure, and call a mobile auto locksmith who can cut and program a new key on site. At Salisbury Auto Keys, we handle these call-outs across Wiltshire, Hampshire, Dorset, and Somerset, so we know exactly how the process works.
Here is what to do, in order:
Check you have not left the keys inside the car or in a bag or coat pocket.
Confirm the car is parked somewhere safe and legal.
Gather your proof of ownership (logbook or V5C).
Call a mobile auto locksmith or your breakdown provider.
Avoid forcing the door or ignition, which can cause expensive damage.
Most people panic and call a dealership first. That is usually the slowest and most costly route.
Check Your Insurance and Breakdown Cover First
Your insurance policy may cover lost car keys, but the details matter. Many comprehensive policies include key cover as an add-on rather than standard, so check your schedule before you assume you are covered.
Look for:
Whether lost key replacement is included or excluded
Your excess for a key claim
Whether you must report the loss to the police first
Any cap on how much the policy pays out
Breakdown cover sometimes includes lockout assistance, but it rarely covers a full replacement key. It may only get you into the vehicle. If you are stranded, that still helps, but you will need a locksmith for the new key itself.
Watch Out Do not drill the lock or rip off door trim to get in. A damaged ignition barrel or door mechanism can turn a simple key replacement into a bodywork repair.
How an Auto Locksmith Handles Lost Car Keys
An auto locksmith replaces lost car keys by reading your vehicle's security data, cutting a new key blade, and programming a transponder chip to match your car. The whole job happens at your home, workplace, or roadside, with no need to tow the car anywhere.
The process usually runs like this:
The locksmith confirms you own the vehicle (logbook and ID).
They connect diagnostic equipment to the car's OBD port.
They retrieve or reset the security code for your model.
A new key blade is cut to match your locks.
The transponder chip or key fob is programmed to the car.
Any old, lost keys are wiped from the system so they can no longer start it.
What Happens to Your Car's Security System
Your car's immobiliser is the reason a random key will not start it. The immobiliser only allows the engine to run when it reads the correct transponder chip, so a lost key cannot simply be copied by a thief.
When a new key is programmed, the locksmith can erase the missing key from the car's memory. This is the key security step most people forget. Without it, a lost key that turns up later could still start your car.
For keyless entry and proximity key systems, the locksmith also handles the remote locking functions, so your new fob locks and unlocks the doors as normal.
Car Key Replacement Cost: What Affects the Price
Car key replacement cost depends on your car's make, model, and key type, not on a flat rate. A simple key blade with a basic chip costs far less than a proximity key for a modern vehicle with keyless entry.
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The main factors are:
Factor | Why It Changes the Price |
Key type | Basic blade vs transponder vs proximity fob |
Vehicle make | Some brands need dealer-only software access |
Age of car | Older cars are often simpler to program |
Location | Roadside and rural call-outs take longer |
Urgency | Out-of-hours jobs carry a higher rate |
Ask us for a clear quote based on your registration and we will tell you what the job involves before we start.
Pro Tip Have your registration and VIN ready before you call. It lets the locksmith confirm the exact key type for your car and give you an accurate quote on the first call.
Auto Locksmith vs Dealership: Which Should You Call?
For most lost key situations, a mobile auto locksmith is faster and cheaper than a dealership. A dealer usually needs the car towed to their site, orders the key from the manufacturer, and books you into a service slot. That can mean days without your car.
An auto locksmith comes to you and often finishes the job the same day. The table below shows the practical differences.
| Auto Locksmith | Dealership |
Where | Your home or roadside | Their site |
Towing needed | Rarely | Often |
Wait time | Usually same day | Days to weeks |
Programming | On-site | In workshop |
Cost | Generally lower | Generally higher |
The one case where a dealer may be necessary is a very new or unusual model that needs manufacturer-only software. A good locksmith will tell you honestly if that applies to your car.
How Long Does It Take to Replace Car Keys?
How long does it take to replace car keys? For most vehicles, a mobile locksmith completes the job in under an hour once on site. Simple blade keys are quicker, while keyless systems and some European models take longer to program.
Timings vary by:
Key type: basic keys are fast, proximity fobs take longer.
Vehicle model: some need extra programming steps.
Access: a car parked in a tight space slows things down.
Travel time: rural call-outs add to the total.
The job itself is rarely the slow part. Waiting for a dealership appointment is what stretches a lost key into a multi-day problem.
Do I Need My VIN to Get a New Car Key?
Yes, your vehicle identification number (VIN) is normally needed to get a new car key. The VIN tells the locksmith the exact build of your car, which confirms the correct key and programming method. You will find it on the V5C logbook, on a plate under the bonnet, or at the base of the windscreen.
You will also need proof of ownership. This is a legal safeguard that stops anyone ordering a key for a car they do not own. Bring:
Your V5C logbook in your name
Photo ID such as a driving licence or passport
Proof of address if the logbook is not in your name
If your keys were stolen, report it to the police and get a crime reference number. Give that number to your insurer for any insurance claim, and tell your locksmith so the stolen keys can be erased from the car's system.
Key Takeaway A new key is only half the job. Always ask for the lost or stolen key to be deleted from the car's memory so it cannot start your vehicle.
Conclusion
Losing every key is stressful, but it is a fixable problem with a clear path: secure the car, gather your documents, and call a mobile specialist. Salisbury Auto Keys is a family-run, RAC-accredited auto locksmith with a fully mobile service, so we come to your home, workplace, or roadside across Wiltshire, Hampshire, Dorset, and Somerset. Every job carries a 12-month guarantee, and our fully insured team works to get you moving again. Ask us now for a clear quote and get back on the road.
Frequently Asked Questions
What happens if you completely lose your car keys?
You cannot start or unlock the car without a programmed key. You will need to contact an auto locksmith or main dealer with proof of ownership (your V5C logbook and photo ID) so a new key can be cut and coded to your vehicle. If the keys were stolen, report it to the police and your insurer, since the existing key codes will need erasing from the immobiliser to stop the stolen key working.
Does my car insurance cover lost car keys?
Many comprehensive policies include lost or stolen key cover, but it is often capped and may only pay out if the keys were stolen rather than simply misplaced. Check your policy documents or call your insurer before arranging a replacement. If you claim, you will usually pay an excess, and a claim may affect your no-claims bonus. Your breakdown cover may also include key assistance as a separate benefit.
How long does it take to replace car keys?
A mobile auto locksmith can often cut and program a replacement key on site within 30 to 60 minutes for common models, provided the correct blank and diagnostic equipment are on board. Main dealers typically need the car booked in and may take several days to order a key from the manufacturer. Rare or high-security keyless systems can take longer if specialist parts are required.
Do I need my VIN to get a new car key?
Yes, the vehicle identification number is normally required. It confirms the exact model, year and key type so the correct blank and security code can be matched. Your VIN is on the V5C logbook, on a plate at the base of the windscreen, and often on a sticker inside the driver's door frame. An auto locksmith can read the VIN directly from the vehicle if you do not have the logbook to hand.
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