Mercedes-Benz Key Replacement
- Covers
- Mercedes-Benz
- Key systems
- Infrared keys, FBS3 and FBS4
- Bring
- ID, registration, VIN
Mercedes keys are the classic dealer-only story, but not every Mercedes is dealer only. It depends on which security system your car has.
Your Key by Era
| Years | Key system | What it means |
|---|---|---|
| Late 1990s to mid 2010s | Infrared key, FBS3 | The chrome key with the infrared eye. Some European key specialists can make these with special equipment. |
| About 2015 on, by model | FBS4 | Mostly dealer only. The dealer orders a key made for your car. |
| Newer models | Keyless Go smart key | Same FBS4 rule for most. |
What a Locksmith Can Usually Do
A specialist may handle many older FBS3 cars and some repairs to existing keys, like a new shell or battery.
When the Dealer Is the Better Call
Most newer models need a key ordered through the dealer with proof of ownership. Expect a wait of several business days.
Tips Worth Knowing
- Before you buy a new key, try a new battery. Mercedes keys are often fine except the battery.
- If the key works but the car will not turn on, the ignition switch may be the problem, not the key.
- Keyless Go cars are a target for relay theft. A signal blocking pouch at home helps.
What It Should Cost
Price follows key type more than brand. Find your key type in our cost table and estimator, then ask for the all-in price with your exact year and model.
These are rough planning ranges drawn from published national price guides in early 2026. They are not quotes and not Louisville prices from any one shop. Your make, model, year, time of day and how many keys you still have will move the number.
Questions People Ask
Can a locksmith make a Mercedes key?
On some older models with FBS3, a specialist can. Most newer Mercedes with FBS4 need a key ordered through the dealer.
Why does a Mercedes key take so long?
On many models the dealer orders a key coded to your car from the factory, which takes several business days.