[187]

I want to use my spare key but it opens/closed the car but it wont start the car.
It always worked.
and then key i always use still works perfectly.
What is wrong with the spare key ??

 

[Gabby07621]

Sounds like the problem below.

http://www.benzworld.org/forums/w220-s-class/1471812-w220-s320-spare-key-will-open.html

The guy opened up his keyfob and soldered the "magic eye" part of the key that interacts with the ignition. Give it a shot, maybe it will work.