tail lights question

[Rustam]

Yes, the black plastic piece was this one:
51491973695
Part no. 9 in the RealOEM diagram:

Thanks!

[bennyg]

I had the errant warnings. Some wires just near the CD stacker in the boot were nicked with exposed wire, one cut. Fixed the lic plate warning and boot lid lights but other warnings only went when I disconnected the headlight vert aim motors. Aus 93 540i Euro spec.