Mercedes-Benz Key Replacement from £250
Mercedes infrared and smart keys require manufacturer-grade programming tools. We program all Mercedes keys from the W203 C-Class onward, including the latest FBS4 smart keys.
Mercedes-Benz key types we program
- FBS3 IR key
- FBS4 smart key
FBS4 keys on the latest A, C, E and S Class are supported.
Why Mercedes-Benz owners choose us
- Dealer-grade Mercedes-Benz programming equipment carried on every van
- No need to tow your Mercedes-Benz to a main dealer — all keys cut and programmed at your location
- Fixed price confirmed against your registration before we set off
- Old keys deleted from the immobiliser for security
- Card payment accepted on-site, full VAT receipt
Spare key or all keys lost?
You still have a working Mercedes-Benz key
A spare or replacement key can usually be added with the working key present. This is the quickest and cheapest route — worth doing before the last key goes.
Spare car keysEvery Mercedes-Benz key is lost
The security data has to be read from the car before a new key can be made, and the lost keys are removed so they can no longer start it. It takes longer and costs more.
Lost car keysMercedes-Benz key not detected or won't start?
- Fit a fresh battery in the key and try again.
- Try your spare key. If the spare works, the first key is the likely fault.
- Use the backup start position in your owner's manual, if your Mercedes-Benz has one.
- If no key is recognised, the fault may be in the car's immobiliser or keyless system — we diagnose it with the car's fault codes before replacing anything.
Check your exact Mercedes-Benz first
Security systems change between models and model years, and a small number of vehicles can only be done by the dealer. Before we book, send us:
- Your registration and approximate year
- Whether any key still works
- A photo of the key, if you have one
- What the dashboard shows, if there is a warning
We will confirm whether we support your exact model and give a fixed price. Proof of ownership (V5C and photo ID) is checked on arrival.
Mercedes-Benz key questions
Can you make a Mercedes-Benz key if I have lost every key?
On many Mercedes-Benz models, yes — but it depends on the exact model, year and security system. Send the registration first and we will confirm whether it can be done at your location or whether a dealer is the only route, before you book.
Is a spare Mercedes-Benz key cheaper than replacing a lost one?
Usually, yes. With a working key the new key can be added to the car more simply. When every key is lost the security data has to be read from the car first, which takes longer and costs more.
My Mercedes-Benz says key not detected — do I need a new key?
Not always. Try a fresh key battery and your spare key first. If the spare works, the original key is likely at fault; if no key is detected, the fault may be in the car and needs a diagnostic check.
What do I need to have ready?
Your registration, the approximate year, whether any key still works, a photo of the key if you have one, and proof of ownership (V5C logbook and photo ID).