The Mercedes-Benz smart key nub is a small but essential component of the smart key system . It is the raised rubber or plastic button on the key fob that allows you to control the vehicle functions with ease.
Key functions
• Lock / Unlock / Boot release
• Transfers finger pressure to the internal key switch
• Built for daily and long-term use
Why it’s important
• A damaged nub can cause delayed or non-responsive buttons
• Replacing it restores smooth and reliable key operation
• More affordable than replacing the entire smart key
Compatible Mercedes-Benz models
This type of key nub is commonly used on:
• C-Class: C180, C200, C250, C300 (W204)
• E-Class: E200, E250, E300 (W212)
• S-Class: S350 (selected models)
• GLK-Class: GLK250, GLK300
• CLS-Class: CLS250,