I am new to this site. Always wanted a BMW and bought a 2004 525I in March of this year. I was browsing for sites that hosted other owners since owning this car can be terrifying. My 525I drives nice and everybody loves it. However, this morning my Service Engine Light Soon appeared and I am freaking out. Called around to several dealers and only one told me it may not be big deal since it has to do with the emission system. The car runs fine. Has anyone had this problem?