On my 2006 525I I had a flat tire, got all of my tires changed from 18 inches to 19 inches. The tires are staggered with the front being a bit smaller in diameter than the back. The BMW dealer says that some of the 2006 BMW tires do not have the tire sensors in them if they were made at the end of 2006, but my thing is if I had a flat tire and the system read flat tire after the spare was put on, then shouldn't that mean that my tires had sensors in them? Now, my ABS light and flat tire lights will not go off and nobody can find any fault in the ABS system. They have also cleared and reset the codes and it went off, but came back on. Can anyone offer any assistance?