Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.