DTC P1642: Me-SFI Control Module (N3/10) Coded Incorrectly: Notes
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2002 Mercedes-Benz SL500, 2002 Mercedes-Benz S500, 2002 Mercedes-Benz S430, 2002 Mercedes-Benz E55, and 2002 Mercedes-Benz E430. 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.