Why can't you go back to the shop where it was broken??

I'm not sure exactly what you are trying to fix, its difficult to help without pictures.
If your trying to get the sensor to stay in place as the clip is broken, have you considered trying double sided sticky pads.
You can get these in various thickness. It may be worth experimenting with these before trying a permanent glue fix.

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'02 X5 3.0d, Auto, Topaz Blue