Welcome to Benzworld, the chip is in the ECU engine control unit but for best replies please start a new thread on the forum for your car, here is a link to the sub forum;
W220 S-Class - Benzworld.org - Mercedes-Benz Discussion Forum
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one
- George Bernard Shaw to Winston Churchill.
"Cannot possibly attend first night, will attend second ... if there is one
- Winston Churchill, in response.