Service

Lost Car Keys | Mobile Car Key Replacement Without The Original

Lost your only car key, or every key to the vehicle? We cut and program a replacement at your car, wherever it's parked, and remove the missing key from the vehicle's memory so it can no longer start the engine.

  • 6+ years' experience
  • Dealer-level programming equipment
  • Fully mobile across Eastleigh and surrounding areas
  • 30–60 minute response
  • Cars, vans and smart keys
Six years of specialist auto locksmith experience
Replacement Nissan smart key held with an Auto Locksmith Eastleigh business card in front of a black Nissan Qashqai in Botley
Mobile help at the vehicle
Vehicle-specific checks first
  • AVG Same Day Service
  • DBS Checked
  • 5★ Reviews

Not A National Company

A local business, not a call centre.

Real Local Professionals

Locals, not technicians sent by a middle-man company.

No Inflated Pricing

National companies often mark prices up 2–3x. We don't.

Deal Direct With The Technician

No wondering who or when. It's always us.

Lost keys

Lost Your Car Keys? A Replacement Can Be Made At Your Vehicle

Losing your car keys doesn't mean a recovery truck and a week at the dealer. A mobile auto locksmith can make a new key at the vehicle, even when no key is left to copy, and have you driving again the same day in most cases.

We carry key blanks, remote fobs, smart keys, cutting machines and diagnostic programming equipment in the van, so the whole job happens where your car is. This page covers lost keys specifically; for broader replacement work, see our Car Key Replacement hub.

Auto locksmith holding a freshly cut car key beside a car door lock
Fully equipped mobile auto locksmith van with key cutting machine
All situations

Lost Car Key Replacement For Cars, Vans & Modern Key Systems

Lost key jobs fall into two main situations: every key is gone, or one is lost but another still works. Both are handled at the vehicle, but the process and price differ.

All Keys Lost — When There Is No Working Key To Copy. When no working key remains, we build a new key from the vehicle itself, cutting the blade from the lock and programming the chip to the immobiliser.

Lost One Key But Still Have A Working Spare. If you've lost one key but still have another, we can copy the working key's blade, program a replacement and remove the lost key from the vehicle's authorised key list.

That last step matters. Without it, whoever finds your lost key could still use it. If you're down to your last key, see Spare Car Keys for why it's worth acting before that one goes too.

Lost Remote Fobs, Transponder Keys & Smart Keys

We replace lost basic transponder keys, remote-locking fobs and keyless smart keys, programming each function the vehicle uses.

Lost Van Keys & Commercial Vehicle Keys

Lost van keys are replaced on site just like car keys, which matters when a working vehicle is off the road.

Ford Transits, Volkswagen Transporters, Vauxhall Vivaros and similar vans make up a good share of our lost key work. For trades, a same-day replacement means a lost key costs an hour, not a week of work.

Lost your keys right now? Call 023 8218 2738 or text us your registration.

First steps

Lost Your Keys? Here's What Happens Next

What Should You Do If You've Lost Your Only Car Key?

First, retrace your steps and check with anywhere you've recently been, as keys are often handed in. If it's really gone, don't try to force the locks. Call a mobile auto locksmith with your vehicle details and location, and we can make and program a new key at the car.

If you think the key was stolen rather than lost, report it to the police as well, particularly if your address was with it.

Can A Locksmith Replace A Car Key Without The Original?

Yes. An auto locksmith can make a car key without the original by decoding the vehicle's lock to cut a new blade and programming a new transponder or smart key directly to the car's immobiliser. The original key isn't needed at any stage.

The method

How Do We Make A New Car Key When All Keys Are Lost?

We make a new car key by identifying the correct key type, cutting the blade from the vehicle's lock, programming the transponder to the immobiliser and deleting any lost keys. The exact method depends on the manufacturer, model, age and security system.

01

Identifying & Cutting The Correct Key Without An Original

Using your registration, make, model and year, we identify the key profile, chip type and remote frequency before we set off.

On site, we decode the door lock with specialist decoding tools to read the cuts, then cut the blade on our machine. At this point the key will turn the locks, but it won't start the engine yet.

02

Programming The Transponder To The Vehicle Immobiliser

The immobiliser only allows the engine to start when it recognises an authorised transponder, so the new key must be registered with the vehicle's security system.

On many vehicles this is done through the OBD diagnostic port. Some manufacturers, including Ford, Vauxhall and Nissan, require a security PIN code as part of the procedure, which our equipment can obtain from the vehicle. During programming, the vehicle's key list is updated so only the keys present are authorised.

03

When OBD Programming Isn't Enough

Some vehicles store key data in a security module that can't be fully accessed through the diagnostic port, so we work on the module directly.

On BMWs, key data sits in the CAS module on older models or the FEM and BDC on later ones. Mercedes-Benz keys are prepared using data read from the EIS (electronic ignition switch). Volvo uses the CEM, Peugeot and Citroën the BSI, and Ford and others use a BCM. In these cases we may need to read the module's EEPROM or prepare the new key from its security data.

04

Testing The Key, Remote & Vehicle Before The Job Is Complete

Before the job is signed off, we test that the new key locks, unlocks and starts the vehicle, and that remote and keyless functions all work.

Vehicles

Lost Car Key Replacement By Make

BMW, Audi, Mercedes-Benz, Land Rover, Jaguar, Volvo, Ford, Volkswagen, Vauxhall, Peugeot, Renault, Toyota, Nissan, Honda, Mazda, Hyundai, Kia and more.

Makes covered

From Ford & Vauxhall To BMW, Audi & Mercedes-Benz

We replace lost keys for most mainstream and premium makes, from Ford, Vauxhall and Volkswagen to BMW, Audi, Mercedes-Benz and Land Rover.

Japanese and Korean makes such as Toyota, Nissan, Honda, Hyundai and Kia are routine work too, including many Toyota and Nissan imports.

Smart proximity car key fob and transponder chip
Diagnostic tablet connected to a car's OBD port
Modern systems

Smart Keys, Keyless Vehicles & Modern Immobiliser Systems

Keyless vehicles can have lost keys replaced, but the process usually involves more than plugging into the diagnostic port.

Newer immobilisers store key data in security modules that sometimes need to be read directly, and keyless systems add proximity and push-button functions that must be programmed alongside the transponder. We carry the equipment to handle both at the vehicle.

Free quote

Get a free quote in two quick steps

Send your details and we'll call you back with a price. For anything urgent, just call.

  • Price explained before any work
  • No upfront payment
  • Deal direct with the technician
Or call 023 8218 2738

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Your options

Auto Locksmith Or Main Dealer For Lost Car Keys?

Both can replace lost keys, but they work differently. The main advantage of a specialist mobile auto locksmith is that the work can often be completed where the vehicle is, without recovery or dealership logistics.

FactorMobile Auto LocksmithMain Dealer
Comes to the vehicleFully mobile serviceYou take the vehicle to them
Vehicle recoveryNo recoveryRecovery always needed
Key cuttingOn siteFrom the dealer factory
ProgrammingOn siteDealer workshop
All keys lostSupported on most makes and modelsSupported
Appointment processOften same or next day2 week wait minimum

Do You Need To Have The Vehicle Recovered To A Dealership?

In most cases, no. Because we cut and program at the vehicle, there's usually no need to arrange recovery, which avoids both the cost and the time without your car.

Why A Mobile Auto Locksmith Can Replace Keys At The Vehicle

Modern locksmith programming equipment gives us access to the same security functions needed for key programming, and the van carries everything required to cut, program and test on site.

Pricing

Is Replacing A Lost Key Expensive?

There isn't one universal price for replacing a lost car key, because the vehicle, key type and programming method all vary. A spare-style replacement with a working key is usually cheaper than an all keys lost job. We give you a clear price before any work starts, with no upfront payment.

Why An All-Keys-Lost Job Can Cost More Than A Spare Key

With no key to copy, we have to decode the lock and often carry out deeper programming, which takes more time and equipment than duplicating a working key.

Vehicle Make, Key Type & Programming Method Affect The Price

A basic transponder key costs less than a remote fob, and a remote costs less than a smart key. Vehicles needing module-level programming also take longer.

Clear Pricing Before Work Begins — No Upfront Payment

You'll know the price before we start, with no upfront payment, no hidden additions and no obligation to go ahead.

If the job turns out to be different from the description given, for example a different key system than expected, we'll explain the revised cost before continuing. If you decline the revised quotation, there's no call-out charge.

Get a clear quote — call 023 8218 2738 or text your registration.

Recent work

All-Keys-Lost Jobs Around Eastleigh

Typical lost key jobs and how they're resolved at the vehicle.

BMW All Keys Lost — Replacement Key Cut & Programmed

A BMW with no remaining keys typically involves reading data from the CAS or FEM module, preparing a new key and cutting the emergency blade.

Ford Transit Lost Only Key — New Remote Key Made On Site

A Transit with its only key lost can usually have a new remote key cut from the lock and programmed with the vehicle's PIN code, getting the van back to work the same day.

Audi Lost Key — Replacement Programmed To The Vehicle

Where one Audi key is lost and another still works, we add a replacement and remove the missing key from the vehicle's authorised list.

See more Recent Jobs or call 023 8218 2738.

FAQ

Lost Key Questions

Related services

Other Key Problems We Solve

Need A Spare Car Key Before The Only Key Gets Lost?

A spare costs far less than an all keys lost replacement.

Having Problems With A Remote Or Transponder Key?

If the key isn't lost but has stopped working, it may just need reprogramming. If the key turns but the car won't recognise it, the fault could be in the ignition.

Keys Locked Inside The Vehicle Rather Than Lost?

If you can see your keys inside the car, you need entry rather than a new key.

Need Urgent Help With Your Vehicle Keys?

For any urgent key or lock problem, including a broken car key.

Get help now

Lost Your Car Keys? Get A Replacement Made At Your Vehicle

Call us and we'll give you a clear price and an arrival time, then come to your car with everything needed to make a new key.

It helps to have these details ready when you get in touch:

  • Vehicle make, model and year
  • Registration number
  • Whether all keys are lost or you still have one working key
  • Where the vehicle is right now

We cover Eastleigh, Chandler's Ford, Hedge End, Fair Oak and the surrounding areas, or contact us online.

Mobile coverage across Eastleigh & surrounding areas