My car (C270D) is now six years old and the plastic part of my car key is slowly breaking up. £225 is the cost of replacement, my dealer tells me. While I am about it I think I should replace my wife's key, also showing signs of cracking, and wonder whether the second key will cost a s much. I wonder whether the initial setting up to reproduce the key is where the cost is, and the second one might be a little "cheaper". Is that a forlorn hope? Hope to hear from someone.