Where is transmission control module located on 1998 BMW 740il?

The transmission control module (TCM) in a 1998 BMW 740iL is typically located in the trunk, specifically on the left side behind the trim panel. To access it, you'll need to remove the trunk lining and possibly some additional panels. The TCM is a rectangular metal box that is mounted to the vehicle's structure. Always ensure to disconnect the battery before working on electronic components.