I didn't really like the standard steering wheel of my Z4 E89 sDrive28i, so I ordered the M-Sports steering wheel and replaced it.
The part I ordered is 32307842925 - this is only the M-Sports heated steering wheel and not the media controls or airbag, I re-used those from the standard steering wheel.
Procedure:
- Disconnect the battery and wait 30 minutes just to be sure.
- Touch some sort of grounding so you're not static-charged.
- Use a small screwdriver to disconnect the Airbag.
- Use the plastic wedge tools from an iFixit kit to pry loose the cables.
- Unscrew the media controls, remove them from the standard steering wheel and screw them in place on the M-Sports steering wheel.
- Use the same wedge tool to route all the cables back in their place.
- Set the Torque Wrench to 62,5nm and fix the bolt on the steering wheel
- Put the airbag back
- Connect the battery again, started car and 0 error messages
