Mercedes-Benz car key replacement, every model and year

Mercedes-Benz models in the guide

• C-Class
• E-Class
• GLA
• GLC (incl. GLK)
• GLE (incl. ML/M-Class)
• S-Class

How have Mercedes-Benz keys changed over the years?

Every Mercedes-Benz we work from in our reference data uses an electronic SmartKey rather than a conventional transponder key. That matters, because on many other makes a chip can simply be read and copied. A Mercedes key is a different animal, and which kind of Mercedes you drive decides almost everything about what can be done and how fast.

From the late 1990s through roughly 2014, Mercedes used the DAS3/FBS3 system. The key is the familiar infrared 'Chrome key' or the black SmartKey. It slides into the EIS/EZS electronic ignition and twists. The key and the car exchange rolling codes over infrared, so there is no clone-able chip in the way there is on, say, a Toyota. That does not make a new key impossible. It means the work is done by reading the car's ignition module and generating a new key, not by copying the old one.

Mercedes then moved to the FBS4 system on a rolling, model-by-model schedule rather than all at once. The dates that matter:

• Facelifted W212 E-Class: FBS4 from April 2013 production.
• CLA and GLA (models 117 and 156): FBS4 from November 2014.
• 2014 S-Class (W222), 2015 C-Class (W205), 2016 GLC (X253) and 2017 E-Class (W213): FBS4 from launch.
• FBS4 cars generally pair with standard push-button start, and FBS4 keys are coded to the VIN at the factory.

Why the W166 ML and GLE gets checked by VIN

The W166 ML/GLE is the awkward one, and we would rather say so than guess. Most W166 cars stayed on FBS3 through the end of production in 2019. But Mercedes' own fallback-process bulletin (S-B-80.57/62e) lists model 166 from July 2013 production among the vehicles that can be FBS4. So a late-build GLE is not something we assume either way. We confirm the system by VIN before quoting a plan, because the answer changes whether we can do the job on your curb or whether you need the dealer.

What does key replacement involve for each Mercedes-Benz key era?

The honest answer is that it is two different jobs depending on the system in the car.

On FBS3 cars (roughly 2000 to 2014, plus most GLE/W166 cars through 2019 once confirmed FBS3 by VIN), specialist locksmiths can do the full job. Professional tools such as Xhorse VVDI MB, Abrites and the Autel IM-series read the EIS/EZS over infrared or through the OBD port, calculate the key password online, and generate a new key. That works for an added spare, a replacement for a worn key, and an all-keys-lost situation. We do it where the car is parked.

On FBS4 cars (approximately 2015 onward, and earlier on some models), added or replacement keys are effectively dealer-only. We say that plainly because some locksmith ads blur it. Keys are ordered pre-coded to the VIN through Mercedes, with proof of ownership. Mercedes' own service bulletin requires the vehicle to be registered as present in Xentry Diagnostics before a key can be enabled or disabled. Expect a multi-day wait. Limited specialist FBS4 capability is emerging, but it is not something we would ask you to count on.

• FBS3: on-site work by a specialist, including all keys lost.
• FBS4: VIN-coded key from Mercedes, proof of ownership, vehicle present for Xentry registration, multi-day wait.
• Late W166 and anything near a changeover year: confirmed by VIN, not assumed.

How does a Mercedes-Benz key call work with Wilshire Lock & Key?

Here is what happens when you call, so nothing surprises you.

1. Call (213) 577-1366. Someone answers 24 hours a day, every day. Tell us the model, the year, and whether you still have any working key.
2. Give us the VIN if you can find it, for example on your registration. We use it to sort the car into FBS3 or FBS4, which is the question that decides the job.
3. If the car is FBS4, we tell you on the phone that it is a dealer job, and we explain what to bring and what to expect instead of sending a van that cannot finish the work.
4. If it is FBS3, a technician drives to you. We will ask for proof the car is yours before making a key.
5. On site, the technician reads the EIS/EZS over infrared or OBD, calculates the key password online, and generates the new key. On W204, W207 and pre-facelift W212 chassis, an ESL/ELV steering-lock emulator may be needed for an all-keys-lost job.
6. We cut the emergency blade if the key needs one, program the key, then test the ignition, the remote functions and the door locks before we leave.

What is the reality if you have lost every Mercedes-Benz key?

All keys lost is the call we hear most often on Mercedes, and the outcome depends entirely on the car's era.

If the car is FBS3, the situation is very solvable. With no working key there is nothing to copy, so the technician works from the car itself. The ignition module is read, the key password is calculated online, and a new key is generated. VVDI MB documents this kind of infrared all-keys-lost work on the W204, with an ESL adapter. Specialist all-keys-lost on the W203 through EZS password calculation is routine. The W204 C-Class, the W207 and the pre-facelift W212 E-Class add one more step, the steering-lock emulator, which is why those jobs take a little longer and need the right equipment on the van.

If the car is FBS4, the picture is different and we will not dress it up. A lost key means a VIN-coded order through Mercedes with proof of ownership, and the car has to be registered as present in Xentry before a key can be enabled. That takes days, not hours. If we cannot do your car, we would rather say so on the first call than waste your night. Plan for it: if you have one working FBS4 key today, getting a spare made before the last one goes missing is far easier than starting from nothing.

Mercedes handles key security through its own dealer authorization process rather than the NASTF/SDRM route that many domestic brands use. So there is no secure-data shortcut we can promise on those later cars.

What affects the cost of a Mercedes-Benz key replacement?

We do not quote numbers on a web page because the range between a simple spare and a difficult all-keys-lost job is wide, and a number without your VIN would be a guess. What actually moves the cost:

• Key era. FBS3 work is done by us on site. FBS4 is a Mercedes order, and the price is Mercedes' to set, plus whatever the dealer charges for the visit.
• Spare or all keys lost. With a working key on hand the job is simpler. With none, the module has to be read and the password calculated from scratch.
• Steering-lock emulator. W204, W207 and pre-facelift W212 cars may need an ESL/ELV emulator, which adds equipment and time.
• Key type. A Chrome key, a black SmartKey and a Keyless-Go key are not the same part, and condition of the shell matters if you are reusing it.
• Time of day and location. A night call across Los Angeles or Ventura County is not the same trip as a daytime visit next to our storefront.
• Whether the problem is the key at all. If the real fault is a failed ignition or steering-lock motor, the repair is a different job from making a key.

What are the most common Mercedes-Benz key problems?

Not every 'bad key' is a bad key. Before we cut or program anything, we try to separate a key problem from a car problem. These are the patterns that come up on Mercedes:

• Failed or worn EIS/EZS electronic ignition. The key is not recognized or will not turn.
• Electronic steering lock (ESL/ELV) motor failure on the W204 C-Class and on the W207 and pre-facelift W212 E-Class. The dash wakes up but the key will not turn, which looks exactly like a bad key.
• SmartKeys that wear out and stop syncing after years of daily use.
• Dead fob batteries. The remote buttons die first, then Keyless-Go cars report 'key not detected'.
• Cracked Chrome-key shells, worn buttons and broken emergency blades.
• On FBS4 cars, a lost key that turns into a VIN-coded dealer order with proof of ownership and a multi-day wait. Budget for it.

A battery or shell problem versus a key problem

If the remote has gone weak, try the battery before anything else. On Keyless-Go cars, a dead battery is the first thing that produces 'key not detected', and it is the lighter-cost fix by a wide margin. A cracked shell or worn buttons can often be solved without touching the electronics. If the dash lights up but the key will not turn, especially on a W204, W207 or pre-facelift W212, the steering-lock motor is a prime suspect and a new key will not cure it. We would rather diagnose that honestly than sell you a key you do not need.

Which Mercedes-Benz models do we cover, and what does each generation mean?

C-Class is a good example of how much the generation matters. Our C-Class guide at C-Class key replacement goes deeper, but the short version is:

• W202 (1994 to 2000): infrared DAS3 SmartKey era. It is specialist EIS/EZS work, though we have not verified W202-specific tool coverage, so we confirm before promising anything.
• W203 (2001 to 2007): FBS3 Chrome-key era. Specialist all-keys-lost via EZS password calculation is routine.
• W204 (2008 to 2014): FBS3 with the notorious ESL/ELV steering lock. Infrared all-keys-lost is documented with an ESL adapter. The W204 coupe continued into the 2015 model year, so we check those by VIN.
• W205 (2015 to 2021): FBS4 from launch. Added or replacement keys are effectively dealer-only, and push-button start is standard.
• W206 (2022 to 2026): current generation, FBS4 era by platform. We have not verified model-specific key documentation, so we treat it as dealer-only.

Other Mercedes-Benz model pages

The same era logic applies across the range. For the E-Class, the dividing line is the facelifted W212 from April 2013, with the W213 on FBS4 from its 2017 launch. The S-Class W222 was FBS4 from its 2014 launch. The GLC X253 is FBS4 from 2016. The GLE is the one that needs a VIN check, because the W166 mostly stayed FBS3 until 2019 but may be FBS4 from July 2013 production. And the GLA, along with the CLA, moved to FBS4 from November 2014. For other makes, see our car key services overview.

Mobile locksmith or Mercedes dealer: which is right for you?

A fair comparison starts with this: sometimes the dealer is the right answer, and we will tell you when it is.

On an FBS3 car, a specialist locksmith usually makes more sense. We come to you, which matters when the car will not start and you cannot drive it anywhere. We can handle all keys lost on site with professional tools, and the job is usually the more economical route compared with having the car towed to a dealer and waiting for an appointment. You also keep your day.

On an FBS4 car, the dealer is the right place, or at least the place the key has to come from. Keys are VIN-coded through Mercedes, and the Xentry registration step is theirs. We can still help around it: confirming the system by VIN, telling you exactly what paperwork to bring, and handling the non-key problems such as a worn emergency blade, a cracked shell, or a diagnosis of whether the issue is really the ignition. Where a limited specialist FBS4 option exists, we will say so honestly, but we will not build your plan around it.

If you are not sure which camp your car falls into, a call with your VIN settles it. That is a better first step than guessing and paying for a visit that cannot finish the job.

Why call Wilshire Lock & Key for a Mercedes-Benz?

We have been in business since 1987, with a storefront at 10740 Wilshire Blvd in Los Angeles (Westwood, 90024) and mobile service vans. We serve 140 cities across Los Angeles and Ventura counties. When you call (213) 577-1366, you are reaching one company, not a dispatch middleman who passes your job to whoever picks it up. David, the owner and lead technician, oversees the work.

Because Mercedes is a car where the wrong call wastes real time, we put the honest sorting first: FBS3 or FBS4, spare or all keys lost, key problem or steering-lock problem. You will hear that on the phone before anyone drives out.

One more thing worth knowing about any locksmith you hire: California requires locksmith companies to hold a BSIS LCO license. Ask any locksmith for it before they start work. It is a reasonable question, and a good company will not mind answering it. You can reach us anytime through the contact page or start from our home page.