DTC P1642: Me-SFI Control Module (N3/10) Incorrectly Coded: Notes
WARNING: This page is about a different car, the 2002 Mercedes-Benz G500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This trouble code is set because the ME-SFI control module was coded to a manual transmission when vehicle is equipped with an automatic transmission.