Hi,

I have my 2003 R53 in front end service mode to change the alternator and noticed a bracket underneath the car that I don't recognize. Can anyone identify it?

 

Just a wild guess but it looks like the plate that is the mount for the radiator fan electrical connectors just to the left of the drivers side hood latch as seen from standing in front of the car. On my "03 there's what looks like a air conditioner refrigerant line that also attaches to it.

 

That's probably it. I'll check.