If you are trying to buy a cover for a Mercedes key, the model year of your car is the least useful thing to go on. Mercedes ran two key bodies side by side for years, sold the same key across a dozen model lines, and changed the button layout mid-generation. What actually decides the fit is the outline of the key and the number of buttons on the front. Here are the three shapes you are almost certainly holding.
1. The chrome arrow key
The one most people picture when they think "Mercedes key". Teardrop or arrowhead shaped, with a broad chrome band running around the edge, a three-pointed star in a circle at the wide end, and three buttons in a vertical column down the middle. The emergency blade slides out of the narrow end when you press the small release.
This is the key that came with a very large slice of the C, E and S-Class built through the late 2000s and 2010s, plus the SUVs of the same era. If your key has that chrome outline and a rounded, slightly fat body, this is yours.
What trips people up: there are two sizes of this shape, and a shorter, stubbier version exists on some models. If the fitment photo looks right but the proportions feel off in your hand, send us a photo before ordering.
2. The flat four-button key
Newer, and much flatter. A rounded rectangle roughly the shape of a small bar of soap, with a star on the front and four buttons arranged in a square or a diamond rather than a single column. The chrome band is gone or reduced to a thin trim line, and the whole key sits flush in a pocket instead of bulging.
This is the key on the more recent C-Class, E-Class, GLC, GLE, A-Class and CLA. If your key is flat enough that it does not roll when you put it on a table, you have this one.
3. The AMG key
Physically the same body as one of the two above, but finished differently - usually in gloss black or carbon-look, sometimes with red detailing and an AMG badge instead of the plain star. Mechanically identical, so a cover cut for the standard key of that shape will fit.
The catch is aesthetic, not dimensional: an AMG key already looks the part, so a cover that hides the badge defeats the point. Our Mercedes covers leave the emblem window open for exactly this reason.
How to check in ten seconds
- Put the key flat on a table. Does it rock and roll (chrome arrow) or sit still (flat key)?
- Count the buttons on the front. Three in a line, or four in a square?
- Look at the edge. Broad chrome band, or a thin trim line?
Those three answers identify the key without knowing a single thing about the car. If you want to see the shapes photographed side by side, the key fob cover fitment guide lays them out.
The mistake we see most
People order by model year. "It is a 2016 C-Class, so it must be key X." Mercedes sold 2016 C-Class cars with both key bodies depending on trim, market and whether the car was built before or after a running change. We have exchanged enough covers on this exact assumption to be blunt about it: look at the key, not the logbook.
Before you order
Compare the fitment photo in the listing with the key in your pocket. If you are between two shapes, send a photo to us and we confirm before anything ships - it takes a few minutes and saves an exchange. And if the cover does turn out to be the wrong type, we swap it free and pay the return.
Once you know which key you have, pick the finish: Alcantara suede for grip and a cabin-matching feel, carbon fiber for something rigid and light, or leather if you want it to age.
Frequently asked questions
How do I know if my Mercedes key is the chrome arrow or the flat key?
Put it flat on a table. The chrome arrow key is rounded and rocks; the newer flat key sits still. The arrow key also has three buttons in a vertical column, the flat key has four.
Does the AMG key need a different cover?
No. The AMG key uses the same body as the standard key of that generation - only the finish differs. A cover cut for that shape fits.
Will a cover stop me using the emergency blade?
No. The blade still releases with the cover fitted on every Mercedes cover we make.
My key looks like neither shape. What now?
Send us a photo. Mercedes used a few regional and low-volume variants, and we would rather identify it for you than have you guess.
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