I have a 2004 BMW 760i. I just put the spare tire on and now the computer is telling me all kinds of things. First it said I had a flat. Then it said I was low on oil. Then it said I was out of gas ( when I had a half a tank ) then it said something about the transmission. The spare tire is a little larger then the others. The rear tires are 275/35/20 and the spare on the drivers side rear is 245/45/20. Any thoughts on this? Can the spare tire being a different size, affect the computer warnings?