Smart Key Replacement & Mobile Locksmith Services
Lost your Smart keys, worn out a fob, or stuck with an ignition that will not turn? We cut and programme replacement Smart keys at your vehicle across London, Surrey, Sussex and Kent, from the classic fortwo and forfour through to the Smart #1 and #3.
Smart Key Replacement in Short
247 Auto Locksmith is a mobile auto locksmith that replaces lost, stolen, broken and spare Smart keys at your location across London, Surrey, Sussex and Kent. We cut the blade and programme the transponder or keyless fob at your vehicle in around 30 to 60 minutes, for a fixed price agreed before we start, so there is no dealer appointment and no recovery truck.
- All keys lost? We can make a new key without your original.
- fortwo and forfour keys programmed on-site.
- Smart #1 and #3 electric keys covered.
- Smart keyless fobs supplied and paired.
- No call-out fee and a fixed price before we start.
- RAC accredited and Trading Standards approved.
Our Smart Key & Lock Services
Every service below is carried out at your home, workplace or roadside by a fully equipped mobile technician.
Lost Smart Keys
Complete replacement when every key is lost or stolen. We read the immobiliser, cut a new blade to factory spec and code the transponder to your vehicle on-site.
Smart Key & Fob Repair
Split case, buttons that no longer respond, or a blade snapped in the lock? Repair is often far cheaper than a full Smart key replacement.
Smart Spare Keys
Cut and programmed at your door for a fraction of an all-keys-lost job. Essential if your Smart is down to a single key.
Key Fob & Keyless Programming
Immobiliser light staying on or central locking gone dead? We programme Smart transponder chips, remotes and keyless fobs.
Emergency Vehicle Opening
Keys locked inside your Smart? We open Smart vehicles without damage to the door, lock or glass, then get you moving.
Ignition Barrel Replacement
For a Smart key that sticks, jams or spins freely, a common fault on high-mileage models. We repair or replace the worn barrel and match it to your existing keys.
Why Choose Us for Your Smart
Main-dealer level diagnostic software and key-cutting machinery covering the whole Smart range, for the Smart range, carried in our vans and brought straight to your vehicle.
Rapid Response
We aim to reach you within 25 to 60 minutes anywhere in our coverage zone, day or night, seven days a week.
RAC Accredited
An RAC approved and Trading Standards assured business, registered in England and Wales.
100% Mobile Service
We travel to your home, workplace, depot or roadside, which saves you a dealer appointment and the cost of recovering the vehicle.
Transparent Fixed Pricing
No call-out fee and no hidden charges. You agree the price before we start, with a warranty on all parts and labour.
Mobile Smart Key Replacement Across London, Surrey, Sussex & Kent
Smart keys are a niche but important job. Classic fortwo owners often struggle when a dealer is no longer interested, while #1 and #3 electric owners hit the same keyless faults as any modern EV. We cover both ends of the range.
Our vans carry the blanks, cutting machinery and diagnostic equipment needed to create a Smart key from scratch and pair it to the immobiliser, so the vehicle is driveable before we leave. You can see the whole of our coverage on the areas we serve page.
Lost every Smart key? You do not need the vehicle recovered.
All-keys-lost is routine work for us. We read the immobiliser or decode the door lock at the vehicle, cut a fresh blade, and programme a new transponder or remote so the vehicle starts and locks normally, usually inside the hour and without recovery.
Classic Smart fortwo and forfour Keys
Older fortwo and forfour keys are still cut and programmed on-site. Worn blades, dead remotes and all-keys-lost jobs are common on high-mileage city cars. We source the correct blank and programme at the vehicle.
Smart #1 and #3 Electric Keys
The newer Smart #1 and #3 use modern keyless fobs. We programme them on-site without a dealer appointment. If you only have one fob, add a spare before it becomes an emergency.
How Our On-Site Smart Key Service Works
- Get a fixed price. Tap the registration panel above or call 07921 365 247. We confirm the exact price for your model and year before dispatching anyone.
- We come to your Smart. A mobile technician arrives at your home, workplace or roadside, typically within 25 to 60 minutes.
- Key cut and coded. We cut the new blade to your vehicle and programme the transponder chip, remote or keyless fob using our own diagnostic equipment.
- Tested and handed over. We test locking, unlocking, ignition and engine start, then hand over a working key with a warranty. Payment is taken only once the job is done.
Full Range of Smart Locksmith Services
Alongside key replacement we handle the whole locking and security side of your vehicle. Explore our lost car key replacement, car key and fob repair, spare car key cutting, transponder and remote programming, emergency vehicle opening, ignition barrel replacement and ESL steering lock programming services. If you are unsure which one you need, describe the symptom on the phone and we will tell you.
Driving something other than a Smart? Browse every manufacturer we cover on the car makes and models hub.
Smart Models We Cover
Keys, blades, fobs and programming coverage across the Smart range.
Cannot see your Smart listed? Call 07921 365 247 and we will confirm coverage straight from your registration.
Stranded Without a Smart Key Right Now?
Talk to a technician, not a call centre. We will give you a fixed price and an arrival time on the first call.
Smart Key Replacement Near You
Mobile coverage across London, Surrey, Sussex and Kent, 24 hours a day.
London
Sussex
Your town not listed? See the full areas we serve map, or just call us with your postcode.
Browse Other Car Makes & Models
Select your vehicle manufacturer below to view its dedicated locksmith service page.
Trusted by Drivers Across the UK
See why motorists rate our mobile auto locksmith service for speed, reliability and honest pricing.
"fortwo key snapped in the door. Extracted and replaced on the street in Croydon."
"Smart #1 fob not detected. New fob paired at my flat car park."
"Only one forfour key left. Spare cut at the house for a fixed price."
Smart Key Replacement Questions
Straight answers to what Smart owners ask us most about keys, fobs and pricing.
Can you replace a lost Smart key if I have no spare key?
Yes. We replace Smart keys even when every key has been lost or stolen, and the vehicle does not need to be recovered to a dealer. Our technicians read the immobiliser or decode the door lock at your vehicle, cut a new blade to factory specification, and programme the transponder to your Smart so it starts and locks normally.
Can you make keys for an older Smart fortwo?
Yes. We still cut and programme keys for fortwo and forfour models, including all-keys-lost jobs at the vehicle when blanks and immobiliser access allow.
Do you cover Smart #1 and #3 keys?
Yes. We supply and programme keyless fobs for the Smart #1 and #3 electric models on-site across London, Surrey, Sussex and Kent.
Which Smart models do you cover?
We cover the Smart fortwo, forfour, #1, #3, Roadster. If your Smart is not listed, call 07921 365 247 and we will confirm coverage from your registration.
How long does a Smart key replacement take?
Most Smart key replacements are cut and programmed on-site within 30 to 60 minutes of our technician arriving. A spare key is quicker than an all-keys-lost job, because when every key is missing the vehicle's immobiliser or door lock has to be read before a new key can be created.
How much does a Smart key replacement cost?
You are given a fixed price before any work begins and there is no call-out fee. The cost depends on your Smart model, its year, and whether you need a basic transponder key, a remote key or a keyless proximity fob. Getting a spare while you still hold a working key is always cheaper than an all-keys-lost replacement. Call 07921 365 247 or use our online quote form for an exact figure.
Which areas do you cover for mobile Smart key replacement?
We cover London, Surrey, Sussex and Kent, 24 hours a day, seven days a week. Our fully equipped vans come to your home, workplace, car park, or roadside, typically reaching you within 25 to 60 minutes depending on your location and the time of day. See the full areas we serve list.
Need a Smart Key or Ignition Repair Today?
Our mobile auto locksmiths are on standby 24/7 across London, Surrey, Sussex and Kent. Call now or message us on WhatsApp for an immediate fixed-price quote.