So, I installed the alarm retrofit kit and did the necessary coding (added $302 to the VO, reset the modules, etc.). Followed the testing instructions on the official BMW Installation instructions and everything works... except for the ultrasonic sensor. I've unplugged/replugged it in, used air to blow out the connection, looked for fraying wires, etc. No dice. At the end of the testing sequence on the BMW instructions it does say something to the effect of "If ultrasonic sensor does not work/activate, contact BMW Technical Hotline for information on installing a modified vehicle order".

What is that? I tried adding $301 to the VO, but it won't let me. Anyone know? Thanks in advance.