Mercedes A-Class Key Replacement & Programming from £260
2012–present • FBS3 / FBS4 • Mobile service across London & the South East. Spare keys from £260, all-keys-lost from £450.
Cut to code, programmed at your address. Typical job 45–90 min.
Spare key serviceNo working key needed. Old keys wiped from the immobiliser so a found key can't restart your car.
Lost-key serviceHow Mercedes A-Class key programming works
Your Mercedes A-Class uses the FBS3 / FBS4 immobiliser system. W176 FBS3 supported via EIS read; W177 FBS4 requires online password retrieval.
Common Mercedes A-Class key & lock issues
- EIS (electronic ignition switch) failure
- Key not detected after low battery
- Steering lock ESL fault
Confirm your exact key type
Enter your registration — we'll confirm the immobiliser type and quote you on the spot.
Get An Instant Auto Locksmith Quote
Enter your reg & postcode. Tick any extras — we'll send a tailored quote via WhatsApp in minutes.
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Fixed price confirmed before we attend · No-damage entry · Dealer-grade key programming
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Services for your Mercedes A-Class
Where we cover for Mercedes keys
Mercedes A-Class — FAQs
How much is a spare key for a Mercedes A-Class?+
£260–£400 cut and programmed at your address. We bring everything to you — no main-dealer trip.
I've lost all keys to my Mercedes A-Class. What now?+
All-keys-lost on a Mercedes A-Class starts at £450. W176 FBS3 supported via EIS read; W177 FBS4 requires online password retrieval. Typical turnaround same-day, occasionally next-day on FBS4 / latest MQB jobs that need online unlock.
Can you program a used Mercedes A-Class key I bought online?+
Most of the time yes — but check the chip type matches your year/chassis. We'll confirm from your reg before quoting. Used FBS4 Mercedes and MQB AES keys need component-protection unlock, which we handle online.
Do you come to my home / work?+
Yes — fully mobile across London and the South East. We cover Harrow, Slough, Heathrow, Uxbridge, Windsor and the surrounding areas.