Trap door part #
 

I was doing an oil change and saw that I'm missing trap door #1, the door before the oil drain door.

I'm looking at RealOEM and cannot find a part number for the first door, but only the second door. Are they the same part?

http://www.realoem.com/bmw/diagrams/d/s/230.png

02 Cover 1 51718268897 $5.73

on Real OEM, if you see "quantity 2" on that flap door part, i'm 99% sure its the same one. I get the same problem sometimes and I find the quantity shown is what helps.

The Dealer techs like to "forget" to put this item back on after the first oil drain, make future changes quicker.

The quantity of this item is only 1. It is the first trap door that doesn't list a part but I know there used to be one. It isn't the oil change door either so I don't know why it is missing.