1) Get the codes read, otherwise you will just be guessing as to the cause of the error.

2) You don't need to use run flats if you don't want to. You do need to reset the tire pressure warning system after changing tires though.

3) Tail light warning isn't related. It is a caused by a bad connection, likely in the tail light socket.

4) It is easier to read your message if you don't use all caps.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue