Mercedes-Benz CLS Key Replacement & Programming in Jacksonville
Service available for pre-2014 (FBS3) Mercedes-Benz CLS — keys from $285. 2014+ FBS4 vehicles require the dealer.
Your CLS (Pre-2014)
FBS3 vehicles — full key replacement on-site at significant savings vs the dealer.
from$285
Dealer reference
$600 – $1,400
Your CLS (2014+)
FBS4 encryption requires dealer-level infrastructure. We do not program new keys for 2014+ Mercedes — please contact the dealer. We can still help with battery/fob sync diagnostics.
Key Specifications — Mercedes-Benz CLS
| Parameter | Value |
|---|---|
| Transponder Chip | NEC / Encrypted IR |
| FCC ID | IYZDC12K / IYZDC11 |
| Key Blade | HU64 |
| Frequency | 433 MHz |
| Immobilizer | Mercedes EIS + DAS / FBS4 |
| Proximity / Smart Key | Yes (2000+) |
About Your 2026 Mercedes-Benz CLS
Mercedes-Benz is one of the most complex mainstream brands in the industry — the only one we treat as a separate routing on the website. The reason is the FBS3-to-FBS4 transition that happened around 2014. FBS3 vehicles (pre-2014) are fully serviceable on-site at significant savings vs the dealer. FBS4 vehicles (2014+) require dealer-level encryption infrastructure for new key programming; we can assist with diagnostics, key shell replacement, and selected procedures, but a brand-new key for an FBS4 car is realistically a dealer job. The good news: most FBS4 'won't start' cases are actually battery / fob sync issues, not requiring a new key. Always call us first before driving to the dealer.
The 2026 Mercedes-Benz CLS is a luxury vehicle. We service this exact luxury vehicle regularly across the Jacksonville area — programming is reliable, the key blank is in stock on the truck, and most spare-key jobs complete in 35–60 minutes on-site without a tow.
2018-and-newer Mercedes use FBS4 second-revision (CLS, AMG GT, EQS, etc.). Same restrictions as 2014–2018.
In Jacksonville
Every Mercedes-Benz CLS job we book in Jacksonville comes with the price quoted on the phone — no bait-and-switch and no after-hours surcharge unless explicitly disclosed before dispatch.
Why book us for your Mercedes-Benz CLS
For pre-2014 Mercedes, we save customers 40–60% vs dealer pricing on full key replacement. For 2014+ Mercedes, we save customers from unnecessary dealer trips when the actual issue is a battery or sync.
Frequently asked questions
Can you make a key for my 2014+ Mercedes?+
For new key programming on 2014+ FBS4 vehicles, the dealer is required. We can assist with battery replacement, fob sync, shell swap, and diagnostics on-site — and most 'won't start' cases are actually sync issues, not requiring a new key.
What's the difference between FBS3 and FBS4?+
FBS3 (pre-2014) uses an encryption that's been broken by aftermarket programmers — that's why we can service it on-site. FBS4 (2014+) uses a new encryption layer that requires dealer-level infrastructure to write new keys.
How much does a pre-2014 Mercedes key cost?+
Pre-2014 Mercedes spare keys typically run $295–$495 cut and programmed on-site, depending on model. Compare to dealer pricing of $500–$1,200.
Ready to book your Mercedes-Benz CLS key?