I had an experience with a mechanic who examined my car W210 who commented the pvc wrapping of wires are cracking and need to be changed. The problem is that the wires come in a set of wire harness and it is costly.
I really don't know if the guy is trying to fleece me.
Any comments?
Thanks

Most of the dealers know of this problem and will replace the wiring harness for free if you yell a little, in or out of warranty.

Our local dealer will do it up to 120k miles. (RBM)

The mechanic told me it cost something like USD 800 to replace it? Is this a common problem? If I do not change it, will it crash the controller?
I'm at 75,000 km now and do not know if it can last how long.
Thanks for sharing