Transmission Identification
As with all BMW transmissions, an identification plate is attached to the transmission housing. The plate provides a two character alpha code signifying identification. Refer to the alpha code when ordering a replacement transmission. This code must be checked against the parts system verifying the code is correct for the specific vehicle and for possible code/part number supersession. See Fig 1 . Alpha codes for the E46 as introduced are "SW" for the 328i and "SX" for the 323i.