Brand New Mercedes Benz ISM Motor (Intelligent Servo Module). This is a OEM part. Part number is 000-270-18-52. This ISM Motor is Installed In All Vehicles That Use a Direct Select Lever to Shift The Transmission. This Motor is Installed in All Mercedes Benz 164 ML and GL Vehicles, The 216 CL Class Vehicles, The 221 S Class Vehicles, and the 212 E class Vehicles. This Control Unit Is a TRP (Theft Relevant Part) from Mercedes Benz and Can NOT Be Purchased Directly From Your Local Mercedes Benz Dealer. The Vehicle Must Be Repaired At The Dealer In Order For You To Be Able To Get This Control Unit. This Control Unit is Not Coded and Once Installed In the Vehicle, It Must Be Coded To The Vehicle Using The Mercedes Benz SDS (Star Diagnostic System) In Order For It To Work. Please Don't Be Fooled By Other Sellers Selling Used ISM Motors As Plug and Play Units. Once This Control Unit Is Installed In A Vehicle And Coded, It wiLl be only for This Vehicle and Can No Longer Be Used In Another Vehicle.  Please call your dealer first to verify if this will work with your car. If you have any questions regarding this Control Unit .